can i stop water flow with nylon bungs?

[Alan Cordt]

Hi all i see monument sell 15mm & 22mm nylon pipe bungs (plugs).

has anyone used them to stop the flow of water? for example from cwsc in the loft when the gate valve wont close to save draining down the system.

was thinking of buying some and next time i come accross a gate valve that dont shut of i will put my hand in the cwsc and bung the pipe to avoid draining down. Will this work though???

Regards

Alan

 

[PlumbBobBob]

i don't see why not i bought some of those for that very purpose although haven't used them yet.

 

[theplumb]

Hi there alan, i have a set that i have had for two years or so,

use them loads and normally keep the 15mm ones in my pocket!

Really usefull but if you get some, try not to over tighten them as they will skip on the treads.

 

[Alan Cordt]

cheers fellas i will definately buy some some now!

 

[Paulus]

I've used them loads. Not just to drain down the system but to change rad valves without draining down. One bung in feed from tank and one in expansion pipe creates a vacuum in system. Some water will escape initially but only a couple of litres usually which you can catch in jug.

 

[Phil]

Every now and then they won't go in the tank connector.

Tamz was saying earlier about a lump of Blu Tack or Plumbers Mait etc will seal enough to swap a gate valve.

 

[GasmanxxxR1]

I use these everyday, i think there great. When i change a cylinder and the gate valve wont shut off i put the 22mm one in the cold feed from the tanks, works a treat

 

[Hardy1]

where can i get a pair?, merchants?, screwfix?, what shops?, thanks.

 

[PlumbBobBob]

screwfix set of six, 15,22 and 28mm

 

[Hardy1]

cheers thanks for that, and just push them into the the valves and turn?)- im thinking about it now and just thinking that cause there rubber bylon as you push them in the rubber just buts up againt the fitting causing it to seal am i right so just shove them in ?? basically( sorry for seeming a bit dumb)

 

[quality]

The bungs are supposed to seal as that is the purpose of it
I have never been a fan of them but for a quick radiator job or similar they may just do the job

 

[Destroyer2813]

Really could of done witha set yesterday bloody gate valve wouldnt shut off to change bathroom taps

 

[quality]

No disrepect but I allways drain down and put a decent quality valve in.
Domestic jobs are mostly one day jobs
It is a different ball game when you drain a school down or nursing home

 

[Phil]

They seal perfectly and I dont even worry about them coming out, you can solder and everything.

Don't fit another gate valve, use a full bore lever valve.

In years gone by it seems gate valves were made to last, and I know of at least one that shuts off fine to this day and thats about 50 years old.
The £5 ones now last about 2 or 3 years before they let by.