Safely blank tank connector at mains pressure?

[ESA9164]

Hi

I need to temporarily remove a downstairs WC where the cistern is fed straight off the mains, just after the stop cock, with no room to fit an isolating valve.

I need to blank/seal the cistern tank connector while the loo is out (which may be for a few weeks).

Mains pressure is 5 bar or more.

Can I safely/reliably seal it with a 1/2 inch brass blanking plug and a new fibre washer or could someone recommend a better solution that doesn't involve soldering a stop-end on in lieu of the tank connector?

Need to be sure it won't leak and flood the whole house.

Would appreciate any helpful suggestions.

Thanks in advance

Andy

 

[PRS1]

If your temp removeing wc remove cistern aswell, Turn water off at stop(1st) tap and fit isolating valve,even if pipework is tight u only need 25mmish to get a pipe slice round it.

 

[ESA9164]

Yes, it's a close-coupled loo, so the cistern will be out as well.

The branch to the cistern is only about 4" long and cranks in three different directions so I'd not get a standard isolating valve on it and be able to reconnect to the cistern after it.

I suppose a flexible pipe with isolating valve would solve the problem, but could I rely on the isolating valve to hold that pressure?

 

[MIGEM]

Can I safely/reliably seal it with a 1/2 inch brass blanking plug and a new fibre washer

Nobody on here knows how capable you are, but Yes.

I suppose a flexible pipe with isolating valve would solve the problem, but could I rely on the isolating valve to hold that pressure?

Yes, it would have been tested to hold more pressure than that, but if in any doubt, isloate the valve and still fit the plug to the open end.

All float operated valves should have an isolation valve.