valve stem seal for xs78

[Andrewjames]

anyone know what material is used for co2 airgun seals?

im looking to replace a worn out valve stem on my qb78 but wasnt sure whether a regular oring is up to the job with co2 involved?

Thanks all

A

[jirushi]

Hi, it's best to use polyurethane.
Mr Lawrie Amatruda is very good at reasealing valve stems.
Lawrie uses a high quality polyurethane which will last for many many years.
He is a very well respected airgunbbs member.
An NBR o-ring will not work for the valve stem.
By the way, for the cap and valve o-rings, it is best to use polyurethane o-rings. They will last much longer than nitril.
Hope this helps.
Cheers, Louis

[Neil54]

Drifting the steel Rod out of the brass is the difficult bit.
If the valve is only weeping you could try ' bedding' it in with a little toothpaste and a drill. Rotating the valve whilst gently pulling on the drill.

There are people on here who make ptfe replacement valves.

[Lawrie Amatruda]

anyone know what material is used for co2 airgun seals?

im looking to replace a worn out valve stem on my qb78 but wasnt sure whether a regular oring is up to the job with co2 involved?

Thanks all

A

You have a PM.

Cheers,

Lawrie.