8x1mm o-ring (NBR 90) for various FX PCP air rifles.

This o-ring is used in several places:
Outer o-ring of the Dynamic valve seat FX20923C: DRS (MKI and MKII), Dynamic (MK1 and MK2) and Panthera (MKI, MKII and Hunter MKII).
Mega valve seat FX2024C: Wildcat MKIII and Maverick.
Power wheel axle: Verminator MKII, Independence, Indy and Gladiator MKII.

The inner o-ring of the Dynamic valve seat is the FX5158 o-ring, preferably replace them together during maintenance.

Tip: lubricate this o-ring with a small film of silicone grease to extend its life.

In doubt if this is the correct o-ring or how many you need? Check the schematic!