Tap flexi's onto 15mm compression

[Hallsy]

The monobloc I have just fitted came with it's own flexi pipes.

The flexi's that I have fitted on other taps around the house have had a 15mm compression nut/fitting on the other end so fit straight onto 15mm pipe.

These have a female 1/2" bsp tap connector on the end. The thread fits a 15mm compression coupling, but will it seal sufficiently? It has an integral rubber washer so I guess it will, but wonder if there is a specific fitting for this?

If this method is OK, can you get solder ring fittings with a male thread (1/2" bsp) on the end? Had a quick look in Screwfix and the only ones they sell are solder to 1/2" nut (female).

 

[chrishutt]

I would use a 15mm isolating valve (cheap jobby) as the connector. Remove nut and olive from downstream end and attach ½" nut on flexi.

 

[Hallsy]

Cheers, so they should seal OK onto 15mm compression thread, minus the olive & nut obviously!!

I would use an isolation valve, but I've already mounted those at ground level.

Ideally I wanted to just run a straight bit of copper up from here to the sink then straight onto the flexi, which is why I asked about solder fittings as I prefer these to bulky compression.

 

[chrishutt]

Anything with a male ½" thread will do, providing it's not too tapered (so that the nut can't be threaded fully on). Might be a problem with soldered fitting, less likely with compression (e.g. ½" x 15mm).

 

[Mike2007]

Don't forget some single check valves if you got a belting mains pressure coming into a monobloc tap. Otherwise it inhibits the flow of the DHW.
Cheers

 

[Hallsy]

OK, I'll stick with a 15mm compression coupler, probably got a couple somewhere!

This is a basin in upstairs bathroom, both feeds are gravity so do I still need to use check valves? They should be reasonably balanced shouldn;t they?

I thought some monoblocs had check valves built in, although the last Bristan one I bought came with one to put on the hot.

 

[Mike2007]

I measured a customers cold outlet recently and my pressure guage hit 7 bar before flying off the tap, soaking me!
As a plumber its a standard fitting for both pipes.