UKC

... please save me from looking like a muppet at Screwfix.

Due to a miscommunication with the guys who fitted my heating system, I've got the washing machine outlets where I want to fit a sink, and vice versa.  I've dealt with the washing machine side of things.

However, I've got to connect the standard washing machine house outlets (male 3/4" BSP, I think) to the flexible hoses to go to my tap (which are female 15mm, I think). Thankfully I had them do both hot and cold feed! 

Is this the adaptor I want? https://www.screwfix.com/p/flomasta-compression-adapting-female-coupler-15m....

I'm not quite sure that the 15mm side is what I need, and I'm also concerned about the comment that the bsp is an unusually long thread.

Erm, I'll try and help but I don't quite understand the question. Pipes are in mm and taps washing machines ect are in inches, if you are connecting pipe to a tap the 15mm end connects to the pipe and the 1/2 or 3/4 inch end connects to the outlet. If you could show me pictures of what your trying to connect I might be more help. 

I think I understand now, you want to connect a 15mm flexible tap connector to a washing machine outlet. You could use that but you'll have to mess about with ptfe tape. 

I think this will work better

https://www.screwfix.com/p/flomasta-compression-straight-tap-connector-15mm...

It has a rubber seal so just a case of screwing it on. Take the nut and olive off the 15mm end and screw the 15mm end of the flexible hose onto the fitting. Before you do double check your flexible tap connector still has a rubber washer in as they can fall out.

Brilliant - thank you. Yes, you're exactly right - I need to fit flexi tap hoses to washing machine outlets, and this looks like it's exactly what I need. It's always a pain trying to google for something when you don't quite know what it's called...

Cheers! Jamie

No worries, your explanation was fine, my reading abilities are not! 

Strictly speaking, you're not supposed to connect a flexible connector to a compression joint in that way, as the end is a bit "sharp" and could cut into the rubber seal - although, in practice, I'm sure plenty of people do.

I can't see it on the Screwfix site (they don't carry everything), but there will be a non-compression version of that adapter with a more "blunt" end for linking to a flexi connector - try your local plumbing specialist.

The best solution would be to swap whatever they've put on for a proper stop end tap connector, if that's do-able.

https://www.screwfix.com/p/compression-washing-machine-valve-without-check-...

Probably what you're looking for 

Mark

Well you live and learn, never noticed that. I've always fitted mine to the end of isolation valves and haven't had any problems. To be safe you could fit one of these to the fitting

https://www.screwfix.com/p/flomasta-compression-adapting-male-coupler-15mm-...

Or straight to the pipe, but then you'd lose the isolation valves if you want them on the taps.

Compression fittings are, by necessity, angled to compress the olive - "flat faced" is the term I couldn't remember earlier.

I've just put a load of these on our sinks at home and could be exactly what the OP needs:

https://www.stevensonplumbing.co.uk/15mm-flat-faced-isolation-valve.html

I don't understand... what stops you unscrewing the washing machine valve and (using the same nut and olive now on the pipe) replacing it with an isolation valve -  then you can add a flexible tap connector? Or vice versa.

Sounds better than using some weird adaption that might leak one day, might be quicker and easier to do it normally. 

Also taps tend to come in hot and cold but these days 99% of washing machines only draw cold, so do you really have hot and cold washing machine valves fitted? 

I get the impression the OP doesn't want to mess about with mains water, if I'm wrong then yes, that would be the part to fit.

So at the washing machine end, the connectors are right at the end of pipe runs, and I have done the 'right' thing - I've cut the 15mm thread connectors off and replaced with 3/4" BSP washing machine connectors, so that's all good.

But where the sink needs to go is right in the middle of a complete muddle of plumbing - it's a pair of inline 3/4" BSP male threads, buried underneath my underfloor heating manifold.  Getting in to cut them out and replace with 15mm will be an absolute nightmare...

Yes, definitely!  We plan to get an Ebac hot & cold fill once our current machine dies, to take advantage of all the super cheap hot water from our heat pump, so I deliberately had them fit both.

Here's one of the BSP outlets (by far the easier one to get to) and the tap hose: