2" Female Normal Pipe Thread (NPT) x 2" Buttress Male Adapter. Connect 2" Buttress to drums, IBC, Totes with a 2" Buttress opening. Please note, not all buttress openings are the same size. Dafnas adapter will fit Buttress fittings that are 2". It will not fit into containers with a 70mm opening and require a 70mm buttress fitting. 2" Male Buttress measure @ 2 3/8" outside diameter 2" Female NPT measures @ 2 3/8" inner diameter