This is a 2 vane rotary style hand pump designed to thread into the 2 inch bung opening on 1555 gallon drums The adjustable bung adaptor allows for easy height adjustment Constructed from Polyphenylene Sulfide with FKM seals and PTFE gaskets, this pump is ideal for aggressive chemicals, chlorinated solvents, and hydrocarbons and more consult chemical compatibility chart for specific compatibility concerns