PrintDischarge Check Valve Cast iron discharge valve bolts directly to pump for priming and pump protection. The valve comes with automatic, spring activated mechanism with external handle. Specs/Part #s Approx. Wt. Lbs. Description Model Number 21 2 1/2" Thread x 3" Thread BEB05922 20 3" Flange x 4" Thread BEB05923 36 4" Flange x 4" Thread BEB05924 55 5" Flange x 5" Thread BEB05925 70 6" Flange x 6" Thread BEB05926