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Message: <blockquote data-quote="bobcat_ron" data-source="post: 10424" data-attributes="member: 1066">The manifold has a pressure relief system built in, when the engine is running there is always pressure between the couplers and the valve and that makes it nearly impossible to hook up the lines, all you gotta do is push on the coupler face and you'll hear a hissing sound, that pressure gets pushed in to the case drain line in the middle.The newer style flat face couplers for the hose ends have a longer profile that has a relief system inside, but it doesn't always work and you still need to crack a fitting to blow off some pressure.</blockquote>