Bild API Drop Adapter Markets Petroleum Cargo Tanks Jump to Section Product Options Related Products Product Options Part Number Size Seal Material 4530 3" Baylast™ O-ring Aluminum 4530G 3" Nitrile Rubber Aluminum 4540 4" Baylast™ O-ring Aluminum 4540F 4" Nitrile Rubber Aluminum Related Products Bild 6200-Series Side-Lever Type Drop Elbow Bild API Drop Adapter Repair Kits Bild API Drop Adapter with Sight Glass Bild API Load Only Valve Bild API Load/Unload Valve Bild Gravity Drop Adapter Dust Cap