Use a Straight Line Sumo series pump to fill and drain older style fat Sac eg Masterline, Williams, Hardline (with screw Cap and rubber plug) ballast bags.

you will need the blue Adoptor as well see https://www.macs.com.au/product/straightline-fat-sac-blue-adapter/

This will only work with Straightline “Sumo Pump” White & “Super Sumo Pumps” Black. (will not work with the bigger Sumo Max Pump)

The perfect fitting for connecting the Launch Pad Sumo pump to Fly High fittings. This fitting will adapt Sumo Link connectors to 3/4″ NPT male thread