2 1/2"-4" 757 1ST OR 2ND CHECK RUBBER

To access the check assemblies there is a stainless steel sleeve that will slide open. On the 2 1/2 - 6" you must unthread the #3 test cock then slide the cover. 8 - 10" uses two Victaulic clamps to hold the stainless sleeve. The 757 uses two self contained cam checks that use a tri-link check mechanism.