FYI - the "spacer" is actually called a back-up ring. It always goes on the low-pressure side of the o-ring. It's purpose is to prevent the o-ring from extruding out of it's groove when a load is applied, ie, hitting a switch, or just driving around.
The reason I'm telling you is because when you actually know the purpose of a piece of equipment or part, you never forget or have to question how it's installed.
The other thing you may want to check out is to get rid of the o-rings and back up rings and have your cylinders fitted with u-cup rings. They're a little harder than regular PTFE o-rings and have a double seal. So on a regular cylinder, it's like being protected by 4 o-rings in each cylinder. Or for the comp cyl's in the second pic, it's like having 6 o-rings.
Last edited by BOUNCIN89MERC2LOW97LHS at Sep 30 2003, 07:50 AM