Bild 400-Series Hammer Union Markets Energy / Oil & Gas Jump to Section Product Options Related Products Product Options Part Number Size Material HU400200 2" Forged Steel HU400300 3" Forged Steel HU400400 4" Forged Steel Related Products Bild Dixon Complete Assembly Frac Fitting Bild EZ Boss-Lock Cam & Groove Type C Coupler x Hose Shank Bild Forged Steel Gate Valve Bild 206-Series Hammer Union Bild 602-Series Hammer Union Bild King Combination Nipple NPT Threaded End No Knurl