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.

SHA12
  • $9.87
(17 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 2 of our total 17 reviews, with an average rating of 5 stars. Read all 17 reviews for MacShock ½ Water Shock Arrestor - Diaphragm.
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Review Summary - 5 out of 5 based on 17 ratings.
October 7, 2026 | Ben Jordan
Great service

Great service and terrific prices

MacDonald Plumbing & Heating Supplies
September 29, 2026 | Graham McIntosh
I am saving over half versus Plumb centre and they dont care!!

I am saving over half versus Plumb centre and they dont care!!
 
I showed them the price and was told these must be crap I ordered from you after they refused to match as it isnt like for like
 
Delivery arrived, these are perfect and I wont be getting ripped off from them again I just looked at other prices and you are lots cheaper on just about everything!
 
Will be ordering every week Well done chaps

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