Check the listing for details. Eight Three Ballast Systems 800lb Sack and 3700gph Pump. Condition: Used. Listed at 200.00 USD. Drop the pump in, set it and forget it. This telescoping system allows you to use a pump that is up to 3 times faster than any conventional plug & play setup. Fits perfectly under the rear seat of a ski boat. Prefer local pickup. Pump + Sack New is $360. + 3700GPH 20AMP power adaptor + Anti-airlock protection+ Won’t burn impeller if left on without water+ Stainless steel impeller shaft+ Rust and corrosion protection+ 15ft Long 12V power adaptor with on and off switch+ 12ft long water hose to fill and drain+ 1.5” diameter hose + Telescoping chamber with roll-top closure system+ 0.6 mm heavy duty tarpaulin material+ High strength welded seams+ 1.5” diameter fill port+ Three 1” diameter external drain/vent ports+ Trapezoid shape to reduce roll