is this a death wish?

[Colin]

What is a grease cap?
[/quote]

Matt,

A grease cap is something reg manufacturers did years ago before they thought of dry enviro kits with double diaphragms. It consisted of a rubber cap that went on the top of the first stage and was filled with silicone fluid or silicone grease to prevent cold water from contacting the main spring and piston in piston style regs. Some manufacturers called them "anti-freeze caps". The old Poseidons used the same system, and many folks would fill them not with silicone, but with vodka, hence sometimes they're also called "booze caps" because after a cold dive you could take a shot of vodka from the reg and warm up. Some old US Divers regs also used silicone fluid in their first stages...they were marketed with the first stage name plus the word "supreme" as I recall, as in Conshelf Supreme.

Colin.