Rad valve , tape or plumbers mate

[foxhole]

Installing a vertical rad and the valve on Stat side is the type with a square section so it needs no tool to fit just a spanner, but when turning it does not tighten fully and if I keep turning it will pass right inside rad or at least up to the point the spanner runs out of purchase on the square sided section.
How do I ensure it does not leak.

 

[seco services]

How do I ensure it does not leak.

ptfe same as any other rad tail.

 

[bengasman]

Plumbers mait is for waste.

 

[foxhole]

Thanks, have used ptfe , just concerned that the valve feels so easy to turn. [Meant boss white , not plumbers mate]

 

[Nige F]

Boss White and hemp boss on it`s own used to be for gas threaded joints

 

[obiplumbkinobi]

locktite 55

 

[foxhole]

Boss White and hemp boss on it`s own used to be for gas threaded joints

Yes still have a bit of hemp left.

 

[mickyg]

locktite 55

ditto, don't use ptfe anymore. this stuff rules

 

[MikeyGas]

If using PTFE tape do 15-20 turns. That will keep you watertight.