The pump comes with interchangeable bung adaptors. The standard bung adaptor is useful when using the pump on containers with external threadings. When using the pump on containers with plastic pull-out Rieke spout, the other adaptor may be used Pump is available in two variants: 1. Downstroke Pump: Suitable for 20-25 litre drums. Downstroke operation with fluid discharge when the handle is pushed down. Very useful when pumping heavy fluids. Supplied with 7 interchangeable bung adaptors that makes it usable on most metal & plastic drums 2. Upstroke Pump: Suitable for use on 50 litre plastic drums. Pump delivers on the upward stroke and includes 2 interchangeable bung adaptors Complete with rigid steel discharge spout & 48 discharge hose.