849AML Cylinder Gasket for Halkey Roberts 840 Manual Inflator and V85000 Auto Inflator.
The 849AML Cylinder Gasket can be bought individually or in a multi pack on this link.
This is the 1/2″ size item.
The cylinder gasket helps guard against the cylinder coming loose. After tightening, the gasket creates a reverse pressure against the thread. The gasket also helps prevent gas leakage during inflation. Cylinders should be checked regularly to make sure they are screwed tight.
Click here for information on the 840 Inflator.