MacDonald Plumbing Supplies MacShock ½ Water Shock Arrestor - Diaphragm

MacDonald Plumbing Supplies MacShock ½ Water Shock Arrestor - Diaphragm

WRAS Approved Mini Expansion Vessel for Pressure Surge Absorption.

SHA12ADD
  • £7.19 inc vat
(2 Customer Reviews)
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The MacShock 1/2" Water Shock Arrestor - Diaphragm is a compact and efficient device designed to absorb pressure surges and prevent water hammer in plumbing systems. It is particularly useful in systems with water meters, non-return devices, and appliances like dishwashers or washing machines. With WRAS approval, this shock arrestor ensures smooth operation, reduces pipe vibrations, and helps protect boilers and other plumbing components from damage caused by sudden changes in water flow.

The MacShock 1/2" Water Shock Arrestor - Diaphragm is designed to tackle the issue of water hammer, a common problem in plumbing systems caused by sudden changes in water flow. This WRAS-approved shock arrestor works by absorbing pressure surges, preventing damage to pipes, reducing vibrations, and extending the lifespan of your plumbing system.
 
Compact and highly effective, it is ideal for single outlets or small groups of outlets, with a capacity of 0.16 litres. The shock arrestor is essential in modern plumbing systems, particularly in homes with water meters or non-return devices, and is often a requirement for boiler warranties.
 
It connects easily via standard R 1/2" fittings, ensuring quick and hassle-free installation. Its durable diaphragm construction ensures long-lasting performance even under high-pressure conditions, with a maximum working pressure of 10 bar.
 
By reducing the risk of leaks and ensuring compliance with boiler warranty requirements, the MacShock 1/2" Water Shock Arrestor is a must-have for homeowners and plumbers alike.
Showing our 2 MacShock ½ Water Shock Arrestor - Diaphragm reviews with an average rating of Excellent. Would you like to write a review?
Review Summary - 5 out of 5 based on 2 ratings.
September 10, 2026 | Pavel
half price of MKM!!!

These are half price of MKM!!! I recommend McDonalds to all my friends

MacDonald Plumbing & Heating Supplies
November 1, 2025 | NICRAM Plumbing and Maintenance
These feel nice and logical to be installed.

Recently I have installed a cold feed for three large laboratory appliances (dishwasher, purifier and distillator) It seem logical, that three devices wih rapidly switching valves would benefit from shock limiter/aborption.
I think I will start installing more in the domestic settings.

MacDonald Plumbing & Heating Supplies

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