Stainless steel spring and steel ball The threads are roll formed, This process results in a stronger and smoother thread than one that is cut The chamber for the ball and spring is precision reamed and the seat for the stainless steel ball is machined to exacting tolerances Zinc chromate-plating withstands a 30 hour salt spray Other plating with higher salt spray results is also available Patented thread sealing system seals the threads when the bleeding operation is performed, preventing air from being sucked back into the system Replaces OEM 43352-MG9-006