This is a mock up of the vacuum canister feeding the brake booster I'm working on and installing for a test. The mount consists of a tubular frame that is fastened with two bolts. Therefore, it can be quickly and easily removed for access to other things like spark plugs. I may also weld on a larger port/bung that supplies vacuum to the brake booster. Currently it's a 1/8 NPT I believe, and the ID of the fitting is extremely small. Pressure likes a small orifice but vacuum prefers a larger orifice.