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Brass Tee Connector for 1/2" MIP Thread Water Hammer Arrestor + Wash machine

Hi all,

I purchased 1/2" MIP thread water hammer arrestors from Amazon (US), they don't come with Tee joint connectors (adaptors or whatever you call it here).

See pic - AA sized water hammer arrestor with 1/2" MIP thread (screws into 15mm brass cap - I happen to have one at hand) assume it is our 15mm male?

Looks like I need something like below without the arrestor - brass part (can't find on Bunnings web site) - assume 3/4" swivel nut with 3/4" female thread screws into our water inlet?

These two are for the wash machines to start with (may buy more once I figure out the pattern).

Just checking with experienced DIYer / handyman / plumber to see what the correct brass fittings are for these type of applications before heading into a shop.

TIA

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terrywang

Add to the original question, need to solve water hammer for 2 basin mixers and 2 toilet inlets, they all use 15mm mini cistern cock like below: https://www.bunnings.com.au/kinetic-15mm-chrome-mini-cistern-cock_p4790290

In this case, what connector / joint fitting part should I use?

I believe technically it's

15mm -> Joint ---> 15mm (pass thru) ===> connect to basin tap mixer

15mm Female thread for installing the 1/2" (15mm) male threaded arrestor

EricL

Hi @terrywang

On the condition that your arrestor's fitting can work with the local brass fittings here, I suggest getting the following parts:

Brasshards 20mm Brass Threaded Tee
Brasshards 20 x 15mm Brass Threaded Hex Reducing Bush
Brasshards 20mm Brass Threaded Hexagon Nipple
Kinetic 12mm x 10m White Standard Thread Seal

Before you start putting them together, please make sure that all the male threaded ends are wrapped in the plumber's tape to prevent leaks. Generally, the Tee is attached to the washing machine tap followed by the 20mm brass nipple at the bottom. The reducing bush is then placed on the centre of the tee where the arrestor will be attached. I've attached a sample image to give you an idea of the sequence.

If the arrestor's fitting is imperial you'll need a converter from a plumbing specialist store. It will look like the reducing bush but the inside threads are for imperial plumbing fittings. My only other suggestion is t have a look at the Sioux Chief 20mm Chrome A Size Wash / Dish Water Hammer Arrestor. This does exactly the same thing except that the fittings are already attached making it convenient.

If you need further assistance, please let us know.

Eric

EricL

Hi @terrywang

In regards to the smaller taps, I suggest using the same arrangement but in a 15mm size. I've attached a diagram below to give you an idea of how to put them together. You can also order the Sioux Chief 20mm Chrome A Size Wash / Dish Water Hammer Arrestor in a 15mm fitting so that you won't have to buy the set in separate pieces, I will leave the choice up to you.

In the interest of safety, please make sure to wear safety equipment such as gloves and goggles when working on your plumbing fittings. Don't forget to turn off your water meter at the source to avoid accidental flooding inside the house. Should you feel that there are too many fittings to be altered, I suggest engaging the services of a registered plumber.

If you need further assistance, please let us know.

Eric

terrywang

Thank you so much @EricL . Really appreciate the drawing 😉 Will do this when I have time and report back.

Hope this will help others as well.

terrywang

Thanks @EricL for all the help and advice.

Unfortunately the Tee doesn't fit with the mini cistern cock, tried different methods but it seems that they are just not designed to work together.

I've ordered a tap pressure gauge to test water pressure in the house to start with. I may just get my local plumber to install a water pressure limiting valve (regulator?) once high than usual water pressure is confirmed. If it is still not resolved, then I'll consider further troubleshooting and install hammer arrestors as needed.

EricL

Hi @terrywang

I'm sorry to hear that the fittings did not work out. Engaging the services of a local plumber is for the best as the installation of a pressure limiting valve will help with the excess water pressure inside your plumbing.

Please keep us updated with your progress, we look forward to seeing your water hammer repaired.

Eric

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