Changing stopcock on old black plastic mains

[Bernie Hough]

Hi all

I'm a relatively new plumber and this a job in my own bungalow.

I have a old stopcock that doesn't want to budge at all and my plumber landlord, also my future father in law gave me permission to change it myself and box things in a bit.

My issue is that the plumbfix and plumb centre websites don't help me out much as i'm looking for either a stopcock to fit directly onto the old black plastic mains or fitting an adapter first. The OD appears to be somewhere between 21 and 22 mm.

What would you suggest?

Thanks

 

[Mike Jackson]

Have look for Philmac fittings.

 

[Ermintrude]

Move house ! Or just change gubbings

 

[Irish]

I agree with ermi move house!

 

[lame plumber]

leave the main fitting alone and just change the guts ie valve head

 

[WaterTight]

if boxing in anyway i'd prob leave it be and fit one above it.

 

[Bernie Hough]

Thanks Mike

What are those old pipes called? I know that the blue ones are MDPE.

 

[Dotty]

The black pipe's called alcathene Bernie. Mike's on about the fitting manufacturer.

Philmac: The connection you can trust

 

[snowhead]

Easiest option, as you aren't charging / or paying for labour is to shut it off in the street, remove the stopcock, stick in a vice to hold it firm then undo the valve and free it off

 

[E4gas]

Get the plumber landlord to change it ,

 

[electron]

Get the plumber landlord to change it ,

Yes he is the Landlord after all

 

[Chris F]

I had a block of maisonettes to do that was all alcathene. We found the couplers (had to drive 20 miles) as 4 of the flats had siezed stoptaps so I went to turn off the block and the stop tap in the ground was siezed. Had to take up the slabs and dig it all up. 3 days before Christmas :-( those couplers are class but are a bit big.

 

[stratplus]

leave the main fitting alone and just change the guts ie valve head

What are the chances of finding a new valve head that fits. Surely if you take the guts from a 22mm stop tap that wouldnt fit into the tap he has there??

 

[buckley plumb]

leave the main fitting alone and just change the guts ie valve head

are the guts standard ? didn't have much joy last wk with a gate valve the thread was different

 

[stratplus]

are the guts standard ? didn't have much joy last wk with a gate valve the thread was different

Nobody knows lol

 

[PlumbersMate]

Need a transition coupling from philmac, looks like you'll needs 20mm-15mm

 

[Destroyer2813]

Possibly a 22mm compression coupling 3/4 olive on the black side with a insert in the black plastic normally solves em round my way

 

[lame plumber]

What are the chances of finding a new valve head that fits. Surely if you take the guts from a 22mm stop tap that wouldnt fit into the tap he has there??

wouldnt suggest it if I hadnt done it previously

 

[cr0ft]

Hi all

I'm a relatively new plumber and this a job in my own bungalow.

I have a old stopcock that doesn't want to budge at all and my plumber landlord, also my future father in law gave me permission to change it myself and box things in a bit.

My issue is that the plumbfix and plumb centre websites don't help me out much as i'm looking for either a stopcock to fit directly onto the old black plastic mains or fitting an adapter first. The OD appears to be somewhere between 21 and 22 mm.

What would you suggest?

Thanks

View attachment 17828

Replace the working parts only, assuming there are no leaks from any of the compression nuts. I will bet you a fiver that the workings from a new stopcock will fit that one perfectly.

 

[helpsy]

20mm Philmac with 15mm copper adaptor, or 20mm philmac with 15mm pushfit end.