Blank required for kuterlite 1700 fitted with black 21.5 o/d alkathene

[rhino666]

I have a kuterlite 'T' fitting with 21.5mm class C black PE water pipe. I need to blank off one port. Can anyone advise what is required please.

 

[ShaunCorbs]

What’s the od of the threads ?

 

[rhino666]

What’s the od of the threads ?

Please see photo of actual fitting. Thread o/d is a little over an inch(27mm) so appears the equivalent of a 22mm fitting(three quarters of an inch). This looks like it may have a tapered insert rather than other similar fittings in my 1970 house that have more thread showing so I guess olives fitted. Trying to avoid undoing the 50 year old union to try and answer my question and possibly cause a problem.

 

[ShaunCorbs]

3/4 cap or 22mm blanking nut depending on pitch should work

 

[rhino666]

3/4 cap or 22mm blanking nut depending on pitch should work

Thank you Shaun. Bit the bullet and undid the union - its a finer pitch and a 22mm nut fits. I think the 3/4 has a wider pitch BSP.
22mm blank cap nut should do it.

 

[ShaunCorbs]

Screwfix have them best to get a couple handy to have in your box

 

[rhino666]

Just to bring closure to this I ordered a 22mm cap and then was informed that the seller was on hols until the end of the month. Took a punt on a 22mm disc as lots available versus very few caps. Worked a treat with a 22mm nut. Please see photo........

 

[Harvest Fields]

But for how long?

 

[rhino666]

But for how long?

Brass to Brass taper fitting that other plumbers seem to rate so how long do you reckon?

 

[Harvest Fields]

Brass to Brass taper fitting that other plumbers seem to rate so how long do you reckon?

No idea. Why not put a 22mm cap with a rubber seal on the inside?

 

[Ben-gee]

If it’s one that’s shaped like an olive and you put a smear of jetlube on it, should last a long long time - as long as nut doesn’t vibrate loose.

 

[WHPES]

You've done the correct thing

 

[rhino666]

I am coming back on to the thread to report that the disc as shown, fitted to 49 year old plumbing with no sealer, just brass to brass contact has worked perfectly so far.
As it is metal to metal and no immediate problem I would see this as a better long term solution than a cap with rubber seal where material degradation and possible loosening of the cap more likely.
I ended up having to buy 5 of these discs and they are quality items. If anyone else has a similar problem will post one out for the price of the stamp