SMK XS /QB/TH front cap Tough seals Pack of 5
These are Tougher and harder for the 78 models.
This is a pack of 5 High Quality harder O rings and a small sachet of Moly 33 O ring lube. These fit the front cap and also the Brass valve body.
It is wise to Check the front cap Orings on a regular basis to ensure that you don't waste your Co2.