Drain cock

[johnny2007]

Hi, quick one.
Can this drain cock be directly connected to a 15mm copper pipe with nut and olive on the thread?
To be clear: can I insert a 15mm pipe at the bottom and use a nut and olive to make a compression joint?
Thanks

Drain Cock ½

Order online at Screwfix.com. Brass, steel and plastic construction. Compression connection. Suitable for water systems only. FREE next day delivery available, free collection in 5 minutes.

www.screwfix.com

 

[Deleted member 267285]

No, they’re designed for a female thread, eg a cylinder.

 

[johnny2007]

Ok.
So I just need a standard one to connect with a compression coupler.
Just wondering: these will go on the lowest point of my central heating system next time I drain it.
Would you use full bore service valves (or other kind of valve?) instead with a short piece of copper pipe where to connect a hose when draining?
If not, why not?

 

[ianmcd]

yes you can do that no problem, or use one of these with the drain cock you already have

Flomasta Compression Adapting Female Coupler 15mm x ½

Order online at Screwfix.com. Female couplers. FREE next day delivery available, free collection in 5 minutes.

www.screwfix.com

 

[johnny2007]

Ok, thanks.

One more question if I may.
As the system is all in hep2o, can I use this

Hep2O Brass Push-Fit Adapting Female Coupler 15mm x ½

Order online at Screwfix.com. Easily convert 15mm Hep2O pipe to a ½

www.screwfix.com

And then this

Drain Cock ½

Order online at Screwfix.com. Brass, steel and plastic construction. Compression connection. Suitable for water systems only. FREE next day delivery available, free collection in 5 minutes.

www.screwfix.com

 

[Deleted member 267285]

I’m not au fait with a lot of Hep fittings, but I don’t see why it wouldn’t work.

 

[johnny2007]

Ok, thanks.
2 more questions please.
1. Do I use ptfe tape or ptfe liquid on the thread? What's the best way?
2. I know that type A drain cocks are better, but what's your favourite brand?
Do they do a full bore?

Thanks

 

[Deleted member 267285]

I see 4 question marks ptfe tape personally. I don’t have a favourite brand, not sure about full bore.

 

[johnny2007]

Eventually I found that I can simply use a compression nut and olive on the threaded male drain cock.
So I don't need the hep2o female adaptor.
Do you agree?

 

[JohnD]

If the makers designed it like that, a clever move.

Does it have a bevelled seating to fit the olive and pipe?

As for full bore, you can buy a different type of valve, not a drain cock. Read the spec to ensure it will withstand high temperatures. I got a Pegler one with a hose nozzle on the outlet. Something like this apart from the nozzle.

Pegler PB300 Compression Full Bore 15mm Ball Valve with Red Handle - Screwfix

Order online at Screwfix.com. PN16 rated. ¼ turn operation. Full bore. For water, steam, oil and air. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

 

[johnny2007]

Eventually I found that I can simply use a compression nut and olive on the threaded male drain cock.
So I don't need the hep2o female adaptor.
Do you agree?

Sorry, I was totally wrong on this.
There's no flange on the drain cock to accept the olive.
I'll stick to the plan of the female adaptor.
Some liquid thread seal should make a good seal, I use that on garden taps and never had a problem.
After all, I won't be dismantling that joint again any time soon.

 

[Madrab]

Just get one of these & stick a straight coupler on the end of the HEP then push this in the other end

Solder Ring Drain Cock 15mm - Screwfix

Order online at Screwfix.com. Brass construction with rubber seal and 'O' rings. Suitable for water. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

I'm just about sure the solder end is long enough, though may be wrong now that I think of it

 

[JohnD]

Is a drain cock in some way "better" than other types of valve? They seem rather a nuisance to me.

 

[oldbuffer]

1. They have the spigot for the hose pipe already built in.
2. They are tamper resistant in comparison with other types of valve.

 

[HERTS P&D]

Or fit a lever valve, remove the handle and cable tie it to the valve, also you can fit a compression cap on the end of the valve.

Andy