, Material Test Reports Supplied, Meets BPE Specifications BPE BUTT WELD REDUCING CROSS - 20RA ID, 32RA OD - 2" x 1-1/2", Commonly referred to as butt weld fittings, these stainless steel sanitary fittings are welded to connect to tubing or other fittings for a permanent and flush connection..BPE (BioProcessing Equipment) sanitary fittings are highly polished making them suitable for pharmaceutical processing.