Bild Strainer with Spring-Loaded Check Valve Jump to Section Product Options Related Products Product Options Part Number Size Female Thread Material BVFS20 1-1/2" NPT Brass BVFS25 2" NPT Brass BVFS35 3" NPT Brass BVFS40 4" NPT Brass Related Products Bild Ball Cone Check Valve Female NPT x Female NPT Bild Ball Cone Check Valve Male NPT x Female NPT Bild Domestic Swing Check Valve Bild Safety Check Valve Bild Series-C Check Valve Bild Spring-Loaded Check Valve