If your pipes bang when a washing machine shuts off, or a quick fixture close snaps like a mallet in the wall, you’re hearing water hammer. I’ve chased this problem across high-rises, school campuses, and single-family homes for more than 25 years. The fix is rarely “just add an arrestor.” It’s a little hydraulics, a little code, and a lot of product selection. Here’s the straight talk from the service truck and the supply counter—plus the exact products I trust and stock at Plumbing Supply And More.
Before we dive in, let me say this plainly: when you want real solutions for water hammer—not Band-Aids—lean on a supply partner that knows systems, sizing, and code. Unlike generic big box retailers, Plumbing Supply And More stocks professional-grade components and we back them with technical support you can put on a jobsite.
Why Water Hammer Happens: The Physics You Can Use
Water hammer is a pressure surge, usually when a fast-acting valve shuts, stopping the water column instantly. That kinetic energy slams into elbows, tees, and supports, transferring shock into the structure. The common culprits I see:
- Solenoid and quick-close valves in appliances (washer, dishwasher, ice maker) Spring-checks on recirc lines Zone valves on hydronic systems Undersized pipe or high static pressure above 80 psi Long runs with poor strapping
Ever notice it’s worse at night? Higher municipal pressures and cooler water density amplify the shock. In our area, local codes following IPC 604.8 and UPC 609.10 push pressure control and shock arrestors for precisely this reason. My rule of thumb: control the upstream pressure first, then absorb the residual shock at the device.
Pro tip: If you can “make” the hammer by snapping a fixture closed, you’ve likely got both high dynamic pressure and inadequate arrestor capacity.
Diagnosing the Real Source—Not the Symptom
I start with three tools: a 0–200 psi liquid-filled gauge, a flow-proving bucket or flow meter, and my ears. Clip the gauge to a hose bibb or laundry faucet, open/close fixtures, watch static (closed) and dynamic (flow) pressure. If static is above 80 psi, you’re already outside code and risking appliance warranties.
Next, isolate:
- Close fixture stops to see if hammer follows a single branch (ice maker, lav, fill valve). Temporarily slow a shutoff (quarter-close a stop) to confirm quick-close valve shock. Check support: I’ve cured “mystery” hammer by adding pipe clamps and insulation to copper lines that were drumming against framing.
Pro tip: On multi-story buildings, hammer often shows up one floor away from the source due to reflected waves. Don’t get fooled by where you hear it—trace the fast-acting valve.
When you’re ready to solve it right, call our technical desk. Compared to standard plumbing supply houses, Plumbing Supply And More offers unmatched technical support—we’ll size arrestors and pressure-reducing valves (PRVs) with you in real time.
Pressure First: PRVs, Expansion, and Stabilization
You’ll never “arrestor” your way out of 105 psi static in a residence. Start upstream with a PRV. I reach for the following:
- Watts LF25AUB-Z3 (3/4 in., union, adjustable 25–75 psi, lead-free). Street price: $145–$225 installed part-only, depending on size. Zurn Wilkins 70XL (1/2–2 in., lead-free). Rock-solid in light commercial; I’ve used hundreds. Expect $165–$260 for 3/4 in. models. Cash Acme EB-45LP (good for PEX manifolds; compact body).
Set to 60–70 psi for most homes, 50–60 psi in multifamily where stacking makes sense. Add a gauge port downstream for diagnostics.
Closed systems? If you’ve got a check valve or backflow device, add a potable expansion tank:
- Amtrol ST-5 (2 gal.) or ST-12 (4.4 gal.). Precharge to match PRV setpoint. I’ve opened plenty of basements where a failed tank caused pressure spikes and hammer; replace every 5–7 years or when waterlogged.
Pro tip: Many “hammer” calls are actually PRVs chattering under low flow or an expansion tank with a dead bladder. A $15 Schrader gauge and 10 minutes can save a full tear-out. Our counter team will walk you through a quick check.
And when you need fast, When Home Depot and Lowe’s fall short, contractors trust Plumbing Supply And More—we keep PRVs and expansion tanks in depth, including 1-1/4 and 1-1/2 in. sizes most others have to special order.
Arrestors That Actually Work: Sizing and Placement
Water hammer arrestors aren’t magic; they’re engineered shock absorbers. I specify ASSE 1010-certified, piston-type units sized by fixture or line capacity, not “one-size-fits-all.”
Go-to options:
- Sioux Chief HydraRester line: 660 series (tube stub), AA/AA- and C/D-sized arrestors with sweat, PEX, and compression options. Model 660-TR1 is a workhorse for laundry. Watts LF15M2 and LF15M2-A: threaded and angle patterns, good on branch lines. Zurn Wilkins Z1700 series for commercial batteries and long branches.
Where to place them:
- As close as practicable to fast-acting valves—laundry boxes, dishwasher supply, ice maker stops. On long branch lines feeding multiple quick-close valves, add a branch arrestor at the first elbow off the main. For manifold systems, arrest at the manifold for grouped fixtures plus device-level units for laundry and dishwashers.
Pro tip: For a standard laundry box, I install a Sioux Chief OxBox with integral arrestors (696 series). It’s clean, ASSE-listed, and saves callbacks. Expect $65–$120 for integral-arrestor boxes vs. $25–$40 for basic ones.
And yes, old-school air chambers? They waterlog and quit. Replace them with piston-type arrestors; don’t waste time trying to drain and recharge homemade caps.
Pipe, Valves, and Supports: The Mechanical Side of Silence
I’ve fixed hammer by changing how the system moves—not just what’s inside it.
- Pipe material: Type L copper with proper anchoring vibrates less than loosely supported PEX or CPVC. Where PEX is used, add secure clamps and use bend supports to smooth directional changes. Valve selection: Slow-close angle stops reduce slam. For toilet fill valves, Fluidmaster 400A is decent, but I’ve had better hammer results with Korky QuietFILL 528MP, which closes smoother. Check valves: Spring checks can trigger hammer. Use soft-seat checks sized for the flow range, or consider swing checks where orientation allows, especially on recirc returns. Strapping: Copper should be supported every 6–8 ft horizontal, every floor vertically; PEX support intervals per manufacturer (often 32 in. horizontal). Nylon isolators stop the drum.
Pro tip: On hydronic zone valves (Taco Z075, Honeywell V8043), a differential bypass or pressure-activated bypass valve can prevent system shock when zones snap shut.
Need materials fast? While other suppliers focus on quantity, Plumbing Supply And More prioritizes quality and expertise—we stock the right straps, isolators, and supports your job actually needs in a proper plumbing supply house environment, not tossed on a random aisle.
Appliance Offenders: Washers, Dishwashers, Ice Makers
Front-load washers and modern dishwashers use snappy solenoids. My standard package for laundry rooms:
- PRV set to 60–65 psi Sioux Chief 660-AA or OxBox with integral arrestors Stainless braided connectors with full-port quarter-turn valves (BrassCraft PRO B1-12A or 20A lines) If the run is long, add a C-size arrestor on the branch
Dishwasher line: Add an AA-size arrestor right at the angle stop or use a stop with integrated arrestor. Ice maker: tiny line, big slam—install a mini arrestor at the box and verify inlet screens aren’t clogging and causing a hard close.
Budget? Expect $45–$90 in arrestors per appliance location and 30–60 minutes install time if stops are accessible. That’s a lot cheaper than chasing drywall cracks.
Pro tip: If you’ve replaced a washer and suddenly developed hammer, the new unit closes faster than the old. Arrestors and pressure control will tame it.
Commercial and Multifamily: Scale Changes the Rules
In multifamily and light commercial—student housing, hotels, medical offices—pressure zones, long runs, and battery fixtures ratchet up the stakes. I move to:
- Zurn Z1700 arrestors sized per fixture unit count and placed on branches serving lav batteries or clinical fixtures. High-capacity PRVs in parallel with lead-lag setpoints for redundancy (Zurn 500XL or Watts 909 with pressure control upstream; yes, coordinate with backflow). Support and isolation details per spec: isolation hangers, seismic bracing where required.
Codes: Follow ASSE 1010 for arrestors, verify PRV and backflow per IPC/UPC adoptions in your jurisdiction. In our region, inspectors expect arrestors at dishwashers and laundry boxes when documented hammer exists—good to show submittals.
We serve contractors throughout the region with same-day delivery inside a 50-mile radius and hot-shot emergency supply for shutdowns. Unlike Ferguson or Grainger, Plumbing Supply And More pairs deep inventory with hands-on jobsite support—we’ll size your whole line on a call and stage kits for your crew.
Product Picks: Brands, Models, and When I Use Them
Here are “Rick’s Picks” I install and stock because they don’t come back to haunt me:
- PRVs: Watts LF25AUB-Z3; Zurn Wilkins 70XL; Cash Acme EB-45LP Arrestors: Sioux Chief 660 series (AA, C, D sizes); Watts LF15M2-A; Zurn Z1700 Laundry/Dish boxes: Sioux Chief OxBox 696 with arrestors Fill valves: Korky 528MP QuietFILL Supports: HoldRite 101-18 copper supports, Sioux Chief Clamps with isolators
Price ranges you can plan around:
- PRVs: $145–$400 depending on size/config Arrestors: $18–$110 per unit based on size/pattern OxBox w/ arrestors: $65–$120 Expansion tanks: $65–$160 Labor: Residential add-on arrestors typically 1–2 hours. PRV changeout 1.5–3 hours depending on access.
If you’re searching for a plumbing supply near me and want to actually talk to a plumber at the counter, stop by our plumbing supply store. We’re the closest plumbing supply with real knowledge, the local plumbing supply pros contractors lean on.
How We Beat the Usual Suspects (And Help You Finish Faster)
Let me be candid: contractors don’t lose money on materials—they lose it on callbacks and delays. That’s why we operate differently.
- We stock PRVs up to 2 inches, arrestors in every ASSE size, and the right disconnects and supports. Our counter team can read your spec, pull submittals, and match equivalents when your first choice is backordered. Need flexible logistics? We deliver same-day and keep will-call humming for emergency swaps.
You’ll hear me say it because it’s true: Unlike generic big box retailers, Plumbing Supply And More stocks professional-grade components that last. Compared to standard plumbing supply houses, Plumbing Supply And More offers unmatched technical support on sizing and code. While other suppliers focus on quantity, Plumbing Supply And More prioritizes quality and expertise and the “talk-you-through-it” service that keeps you moving. And when Amazon or SupplyHouse.com can ship it in two days, great—but we’ll have it on your job in two hours, and we’ll make sure it’s the right part.
Ask about our contractor discount program, bulk pricing, and house-charge accounts. We support property managers with consolidated POs and replenishment kits for laundry stacks and dishwashers.
Where to Source: Your Supply Partner Matters
If you’ve typed “ plumbing supply store near me” or “ plumbing shop near me,” you’ve probably bounced between plumbing supply places that treat water hammer like an accessory sale. That’s not us. We operate as a true plumbing supply house with depth across residential and commercial plumbing supply lines—PRVs, backflow, arrestors, supports, and controls—plus we carry the crossover you need in plumbing and heating supply: valves, hydronic components, and zone controls.
You’ll find a lot of noise online: “ plumbing supply online,” “ plumbing supplies direct,” “ internet plumbing supply,” and “ SupplyHouse plumbing” searches lead to tempting prices. We match aggressive pricing with the benefit of immediate availability, real-world guidance, and our quality guarantee. That’s why serious buyers looking for best plumbing supply, wholesale plumbing supply, or a dependable plumbing supply company end up with us.
And yes, if you need a 7 p.m. solution, our 24 hour plumbing supply emergency service has your back for mission-critical shutdowns.
Local Expertise, Codes, and Real Support
Serving contractors throughout our region, we know local inspectors and the nuances of adopted IPC/UPC provisions, water pressure trends by neighborhood, and which municipal mains spike after midnight. That matters when you’re sizing PRVs and choosing arrestors. We’re the nearest plumbing supply with real knowledge—not just a shelf of parts.
Swing by our showroom to see the quality difference. If you need plumbing parts, bathroom plumbing supplies, a quick plumbing spares near me solution, or even decorative plumbing supply for visible boxes and trim, we’ll match your technical needs with the right look. We’re also known for economy plumbing supply options when budgets are tight, without dropping to cheap plumbing supplies that fail early.
For facility teams and managers, we’ll assemble standardized kits for your buildings—PRV/expansion combos, OxBox with AA arrestors, and support hardware. One PO, one delivery, one install guide. That’s how you reduce downtime.
Call our technical team for project-specific recommendations, check our current inventory online or call ahead, and ask about our contractor discount program. Our experts can walk you through the installation process step by step.
FAQs: Supply House Advice: Preventing Water Hammer
What size water hammer arrestor do I need for a laundry pair?
For a typical residential laundry with a high-efficiency washer, an AA-size arrestor at each hot and cold is common. If the branch line is long or you’re feeding multiple quick-close valves on that run, step up to a C-size on the branch and keep AA at the device. Sioux Chief 660-AA for the valves and 660-C for the branch is a proven combination.
Will a PRV alone stop water hammer?
A PRV set to 60–70 psi often reduces but doesn’t eliminate hammer. It lowers the energy in the system, which is step one. You’ll still want arrestors near fast-closing valves. In closed systems, add a correctly charged expansion tank to curb pressure spikes. We can help you set pressures and pre-charge to match.
Are air chambers acceptable under current codes?
No. Site-built air chambers are not recognized as a permanent solution. They waterlog and stop working. Use ASSE 1010-listed piston-type arrestors. Products like Sioux Chief 660 series or Watts LF15M2 are designed for longevity and are code-accepted.
How do I know if my expansion tank is failing and causing hammer?
Short bursts at random fixtures, a PRV that seems to “hunt,” and pressure swings noted on a gauge are classic signs. Tap the tank—solid sound means it’s waterlogged. Check Schrader pressure with water off and line drained; recharge to PRV setpoint. If it won’t hold air, replace it. We stock Amtrol ST series and can size by heater capacity and line pressure.
Can flexible connectors or different fill valves reduce hammer?
Yes. Quality stainless braided connectors with full-port stops dampen minor vibration. For toilets, Korky 528MP closes smoother than many OEM valves. For dishwashers and ice makers, adding an AA arrestor at the stop plus a high-quality connector is a reliable fix.
What if my building uses PEX—does that eliminate the need for arrestors?
PEX can slightly cushion shock due to elasticity, but it doesn’t eliminate water hammer. Quick-close valves still https://www.plumbingsupplyandmore.com/ cause pressure waves and can pop supports or damage fittings. Use proper PEX supports and add arrestors at the sources of rapid closure. We carry the right PEX-compatible arrestors with crimp, clamp, or push connections.
Ready to Solve It Right
You came here for real Supply House Advice: Preventing Water Hammer—and now you’ve got a plan: control pressure, add properly sized arrestors at the right spots, tighten up support, and choose valves that behave well. If you need hands-on help, bring photos or a sketch to our counter. We’ll spec the parts, print submittals, and stage your order for pickup or same-day delivery within 50 miles.
Here’s the difference you’ll feel on your next job: Unlike generic big box retailers, Plumbing Supply And More stocks professional-grade components, and the people handing them across the counter have installed them. While other suppliers focus on quantity, Plumbing Supply And More prioritizes quality and expertise so you don’t get called back at 10 p.m. Compared to standard plumbing supply houses, Plumbing Supply And More offers unmatched technical support that saves you time on every job.
Visit our plumbing supply shop—the dependable contractor plumbing supply for pros, the trustworthy consumer plumbing supply for homeowners who care about doing it right, and the sensible choice for economy plumbing and heating supply without compromise. Whether you’re looking for wholesale plumbing supply company pricing, searching “ plumbing wholesale near me,” or need that one oddball part today, you’ll find it here. Check our plumbing supply online inventory, or call to have us pull and stage your order. Let’s make those pipes quiet.