Ronix - BALLAST BAG EIGHT.3 950 LBSRONIX Ballast Bag Eight. 3 Sizes: 950 lbs Without Pump! HIGH VELOCITY FILL PORT: The Eight. 3 pump has a spring loaded quick connect male adapter, that is designed to easily clamp onto the high velocity fill port of the Fat Sac. Ever had an unexpected flying water hose in your boat? Not no mo. This 1 1 2 diameter fill port has a check valve water gate and a water tight rubber cap. Fitted for use with the high powered Eight. 3 3000GPH or 3700GPH pump.