Image API Two-Piece Drop Adapter with Sight Glass Markets Petroleum Cargo Tanks Jump to Section Product Options Related Products Product Options Part Number Size Seal Material 4501ASSM 3" Baylast™ O-ring Aluminum 4502ASSM 4" Baylast™ O-ring Aluminum Related Products Image 6200-Series Side-Lever Type Drop Elbow Image API Drop Adapter Image API Drop Adapter Repair Kits Image API Drop Adapter with Sight Glass Image API Load Only Valve Image API Load/Unload Valve Image API Two Piece Drop Coupler with Sight Glass Image Dixon Cam & Groove Type DC Dust Cap