ST92F top valve [STTi]

This valve is a replacement for top valve on the green gass magazine for the ST92F.

The original has an oring on top, that replacement does not have. I moved it to the new one, and it's holding.

I found no instructions how to replace it and unfortuntely there's no easy way. There's a base plate at bottom, that is easy to remove. Spring comes out now. Then you need box cutter knife and cut the mag in half, vertically. You should see the line, where it's glued together. After replacement...you need to glue it together again. The chamber where gas is stored can be unscrewed. There's an o-ring there as well (in case you still have a leak after replacing both top and bottom valve..