Drum Pump Adapter

This part will thread in to a standard 55 gallon metal drum and and provide a 45 mm port.The part is an adapter that prevents evaporation of the drum's contents. The adapter includes an interior groove for an o ring if you choose to use one. The pump pictured is the Mc Master Carr part number 43035k67 found here (http://www.mcmaster.com/#catalog/119/347/=qypfkx). I have also included models for a solid bung cap with no hole and a bung with a one inch hole.