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Brass and steel water hammer arrestor with threaded connections

Watts

Watts Water Hammer Arrestor 3/4 in Brass Steel 150 psi

SKU CH-EVHJ-0XPWA

A brass and stainless steel water hammer arrestor with a 3/4 inch connection rated for 150 psi maximum pressure and a 33 to 180 degree Fahrenheit temperature range

  • Size3/4 in
  • Product typePipes, Valves & Fittings
  • Stops pipe hammer with brass and stainless steel construction
  • Handles 150 psi maximum pressure for residential supply lines
  • Operates from 33 to 180 degrees Fahrenheit across seasons
  • Compact 4 5/16 inch height fits tight installations
  • GHT by GHT by NPT connection suits standard plumbing

Brass Steel Water Hammer Arrestor

This 3/4 inch brass and stainless steel water hammer arrestor connects via GHT x GHT x NPT fittings to residential plumbing systems. It absorbs hydraulic shock from sudden valve closure to protect pipe joints and fixtures from damage. The unit suits homeowners and plumbers installing or upgrading supply lines in standard residential applications. It is not intended for industrial high-pressure systems or commercial fire-suppression networks that require specialised pressure ratings.

Thermals Noise and Power Draw

The arrestor operates passively with no moving parts, electrical supply or noise generation across its 33 to 180 degrees Fahrenheit temperature range. It handles a maximum working pressure of 150 psi without maintenance or external energy input. The sealed brass and stainless steel body resists corrosion and thermal cycling in hot and cold water lines. It does not suit steam lines or systems exceeding the stated pressure and temperature limits.

Build Fit and Clearances

The unit measures 4 5/16 inches in overall height and 1 1/4 inches in diameter for inline installation between supply piping and fixtures. Its GHT and NPT connections mate with standard garden-hose and iron-pipe threads without adapters. The compact cylinder frees space in tight cabinets or utility boxes compared with larger chamber-style arrestors. Installers must verify thread compatibility and local code acceptance before fitting.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $30.99
Pricier than about 62% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameWatts
Product typePipes, Valves & Fittings
Size & build
Size3/4 in

Questions about this item

How do I install the 3/4 in GHT x GHT x NPT arrestor, and what step is often missed?

Thread the GHT ends onto the supply lines and the NPT end into the pipe fitting; the step often missed is using thread seal tape on the NPT connection to prevent leaks.

What maintenance will the brass and stainless steel arrestor need over time?

No routine maintenance is required; if water hammer returns, the internal piston seal may have worn and the whole unit should be replaced.

At what pressure limit will the arrestor stop protecting the system?

The arrestor is rated for a maximum of 150 psi; sustained pressure above that can cause the body or seals to fail.

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