Connecting 15mm mains water feed to 22mm bath tap

[spongobongo]

Pretty self-explanatory subject title really.

I'm refitting my bathroom this weekend. The cold feed will be from the mains which is on 15mm copper. Obviously the bath tap requires 22mm pipe. Is it okay to fit a reducing coupling on a 22mm tail from the bath tap to the 15mm mains? I've got pretty decent mains pressure.

The alternative is to reduce the existing 28mm feed from the cold water tank in the loft to 22mm. But I'd rather not.

 

[seco services]

yes just use a 22/15 reducer

 

[spongobongo]

cheers. Thought it would best to check rather than sit red-faced in my bathroom.

 

[gigz]

Better still use a 15mm flexi with a 3/4" tap connector. You can get them with a built in service valve for about £3.50.

 

[leakydave]

or go one better with an end feed 15mm to ¾" tap connector... don't forget the service valve of course

 

[spongobongo]

cheers gigz and leakydave. In the end I used a 15mm flexi with a 3/4" tap connector. It worked a treat.

I won't bore you with the trials and tribulations of my bathroom re-fit over the weekend, suffice it to say that getting a 170cm bath out of a 165cm gap involved lots of chiselling, swearing and brute force.

 

[leakydave]

if the bath was plastic it would be easier to cut it in half... if steel... lots of effort required...

 

[spongobongo]

It was steel, as is the replacement. However, I had the forethought to install a 165cm bath this time. It took ages but well worth the effort.

 

[ChrissyPy]

Morning all,
So I'm doing this exact same job as the OP. However, I'm not very experienced.

Currently I have a 15mm cold copper and a 22mm hot copper which has already been reduced down to a 15mm copper by the previous home owner.

I am using hep2o 15mm pipe and connectors to get up to the back of the bath and I'm trying to figure out what I need to connect to this 2nd hand bath tap which I assume is 22mm.

As a precaution, similar to my recent sink install I want to install a couple of isolator fittings (see photo). These are the ones I used to connect to the sink tap tails I bought. I'm unsure depending on the connection to the tap if this is the correct connection to the isolator I need.

Photo shows what I'm dealing with at the bath tap end. Any assistance and links to products I need would help greatly. Technically with my experience of the sink I can get to the back of the bath and the final bit of my pipework will be that isolator valve picture. So if that would what are the products I need between that and the bath taps?

 

[avonmouth]

Morning all,
So I'm doing this exact same job as the OP. However, I'm not very experienced.

Currently I have a 15mm cold copper and a 22mm hot copper which has already been reduced down to a 15mm copper by the previous home owner.

I am using hep2o 15mm pipe and connectors to get up to the back of the bath and I'm trying to figure out what I need to connect to this 2nd hand bath tap which I assume is 22mm.

As a precaution, similar to my recent sink install I want to install a couple of isolator fittings (see photo). These are the ones I used to connect to the sink tap tails I bought. I'm unsure depending on the connection to the tap if this is the correct connection to the isolator I need.

Photo shows what I'm dealing with at the bath tap end. Any assistance and links to products I need would help greatly. Technically with my experience of the sink I can get to the back of the bath and the final bit of my pipework will be that isolator valve picture. So if that would what are the products I need between that and the bath taps?

The bath tap is 3/4 inch BSP thread.Just get two flexi connectors with iso valves already fitted to them as mentioned above.Toolstation code 85178 for the cold and code 93071 for the hot both 300mm long or get the longer ones at 500mm that they sell.

 

[ChrissyPy]

That's great, thank you very much, I will stick to the 15mm size for the hot otherwise I have to buy 22mm pipe, elbows and the metal inserts and we always had a 15mm hot feed and this is a temporary install anyway.

So looking at the product, the end with the isolator on. Does my 15mm plastic pipe just fit into that and I tighten the nut to secure and seal it?

 

[avonmouth]

That's great, thank you very much, I will stick to the 15mm size for the hot otherwise I have to buy 22mm pipe, elbows and the metal inserts and we always had a 15mm hot feed and this is a temporary install anyway.

So looking at the product, the end with the isolator on. Does my 15mm plastic pipe just fit into that and I tighten the nut to secure and seal it?

They probably do a pushfit as well which might be easier for your pipe.Don't forget using inserts into your pipe before connecting to the flexis.

 

[ChrissyPy]

So apologies. I cannot stress how thick I am.

So when you're referring to the 'pushfit' are you talking about the end of the tap tails connecting onto the last bit of my plastic pipe. To clarify the end of the tail is a pushfit connector type?

 

[avonmouth]

So apologies. I cannot stress how thick I am.

So when you're referring to the 'pushfit' are you talking about the end of the tap tails connecting onto the last bit of my plastic pipe. To clarify the end of the tail is a pushfit connector type?

I am talking about flexi tap connectors that have a 3/4 inch nut that fits onto the tap and the other end pushes onto your existing pipe as in 80338.These have no isolating valves though so you would need to fit two valves on your pipe first or stick to the compression ones with the nut as mentioned above.Your choice

 

[ChrissyPy]

So i've just measured the outside diameter of the thread of the tap end that i intend on screwing onto and its pretty much an inch, so the 3/4 wouldnt fit?