Plastic Isolation valves?

[dhutch]

I making an alteration to the plumbing on our narrowboat to aid winter draining which includes adding a tee piece to a pair of low pipe runs (hot and cold) with an isolation valve which can be opened to drain the system, obviously then during use this remains closed and is not to pass water. Currently system is in 1992 vintage hep20.

Presumably the larger and more expensive of the below is the one to go for, as the other one is not designed be used permanently?
http://www.screwfix.com/p/jg-speedfit-15stvp-stop-cocks-15mm/11400
http://www.screwfix.com/p/jg-speedfit-15esotp-emergency-shut-off-tap-15mm/13133

Im tempted to cap it off with a end fitting and remove that to drain, but that seems like overkill. I could use brass valves, but i dont know if they would be any better for the price, or cheaper.

Not reason speedfit (or any other 15mm based system) wont go onto the hep20? I have a few spare inserts if the speedfit ones wont go into the hep20.


Daniel

 

[hazetimesfive]

whats wrong with drain valves...

 

[dhutch]

whats wrong with drain valves...

Not seen any push-fit ones?

 

[SandyLyon]

whats wrong with drain valves...

Not seen any push-fit ones?

Hep2o, Speedfit, Polypipe etc all make a Brass Drain Cock designed to fit into their push fit socket.

From past experience I would suggest that you use the same brand as your fitting ( hep2o DOC into a Hep2o fitting etc).

This is because the grab teeth cant get a good grip on some of the cheap imported brassware, and the OEM ones have a groove on the brass spigot where the grab ring sits, making sure it stays put.

 

[dhutch]

Hep2o, Speedfit, Polypipe etc all make a Brass Drain Cock designed to fit into their push fit socket.

Ahhh, like these: http://www.screwfix.com/p/jg-speedfit-15bdcp-drain-cocks-15mm/12232

Simple. Thankyou very much.

Daniel