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First, with the old valves and springs still in place, Jesse flips the Zipper's billet head upside down and places a liberal coating of all-purpose grease on the area where the gasket would normally reside. Then, a special acrylic plate with a small hole is placed on top of the grease to create a watertight seal. A graduated cylinder with a petcock and nipple filled with water is placed into the small hole in the acrylic. View Related Article
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