Problem making 1inch brass female fitting watertight

[tonyb61]

Hi, I have a couple of 1" brass female connectors on a hot water cylinder. I'm fitting 1" brass to 22mm compression fittings but I'm struggling to make the connection watertight. I have used lots of PTFE tape but it's still leaking very slightly at the joint between the female spcket and the male fitting. Is jointing paste the only solution ?
Thanks

 

[gasmanrob]

Locktite 55 and jet lube

 

[PlumbBobBob]

^^i agree

 

[lame plumber]

too much ptfe is as bad as too little,too much loctite 55 or any thread sealer can strain the joint, follow the instructions. normally around 8 wraps of ptfe and a swipe of jointing compound will seal the joint.

 

[Chalked]

Hemp and paste on a parallel thread ( old school)!

 

[gasmanrob]

55 has the number of turns required printed on the tub, plus it hasn't got to go on squarely so it's easier to Apply when insulation is in the way. If I had to guess if say you've either rotated the page the wrong way or not gone round enough or not flat and it has stringed up on the bottom

 

[Leo21]

Hemp and paste on a parallel thread ( old school)!

That method is good at taking up sloppy threads brilliantly.

 

[tamz]

Buy 2 cylinder unions and save yourself the hastle but a wean with a biscuit rse could get a female iron to seal.

 

[Mike Jackson]

LOCTITE 577 - Thread Sealant - Henkel

 

[jtsplumbing]

Are you winding the PTFE on in the correct way, if not it will ride up the thread,

 

[quality]

LOCTITE 577 - Thread Sealant - Henkel

Ive used 577 for 20 years and has never failed me yet

 

[SimonG]

Dont use female irons on cylinders, weakens them, use proper cylinder unions.

Ptfe and paste will seal anything.

 

[Leo21]

Dont use female irons on cylinders, weakens them, use proper cylinder unions.

Ptfe and paste will seal anything.

Maybe, but the manufacturers don't like them.

 

[tamz]

Many cylinders come with them now eg center brands or you could use albitecs if you want a compression

 

[tonyb61]

Buy 2 cylinder unions and save yourself the hastle but a wean with a biscuit rse could get a female iron to seal.

I thought cylinder unions fitted onto male iron fittings ? Such as I have on the hot water coil connections. The cold inlet at the tank base is a female 1" iron though.
I'll try and get some loctite 55 as suggested.
Thanks

 

[SimonG]

The last few i have used needed male irons for hold feed and hot/vent top connection.

 

[tonyb61]

The last few i have used needed male irons for hold feed and hot/vent top connection.

Yes the tank has female connectors for the hot feed/vent connections, so needs male irons. Not cylinder unions as suggested by an earlier poster.
The loctite 55 worked a treat, both are dry now
Thanks for all the advice.