Leaderboard

the minimum "budget" way i would do this is to add a manifold to the existing thru-hull and add two tsunami 1200's to it, filling all 3 bags off that thru-hull. thru-hull hardware is expensive so you will save a lot of cost there, and if you don't care about speed those 1200's should be fine sharing the same 1" thru-hull. that's hoping that it's a 1" thru-hull and not 3/4"? a manifold would just be your cost in plastic plumbing parts from home depot so that's cheap. tsunami 1200's are like $40 so you have $80 there for two new and fast pumps. add in some 1" fittings, one check valve for each line, and 1" hose for the bags, and 3/4" fittings and 3/4" hose for vents and you have the fill part taken care of. i've found hose cheapest here or here. for draining and venting you'll need to put some thought into it if you really don't want to drill new holes. ideally, i would buy two new drain ports and install them on opposite sides of the boat, and drain the rear bags on the side opposite they are installed on (this keeps them from ever siphoning). for this you will buy two more tsunami's that attach to the bottom port of each rear bag, so $80 again there. i wouldn't try to use one pump for this because then you can never control if you're trying to list the boat to surf on one side, etc. i definitely wouldn't drain them into the bilge like you were saying. you can likely get by with venting each rear bag to a wye on the existing center ballast vent or bilge hose. venting is necessary so that the bag doesn't fill with air, and acts as an overflow when filling. add check valves here as well. add two Carling fill and drain DPDT switches and some wire and you should be good to go. you have a $30K+ boat, i wouldn't try to shortcut spending $500ish to do this right, even the "cheap" way. ask santa to make all your presents be the stuff above!