SOLD INDIVIDUALLY NEED 2 FOR YOUR BOAT 1 FOR EACH V-DRIVE COMPARTMENT 550 POUNDS EACH 2 QUANTITY OF 1-1/8" FITTINGS CEMENTED IN FOR FILL/EMPTY - W743-SS 1 QUANTITY AIR PLUG FOR MANUAL VENTING - W749 1 QUANTITY 3/4" FITTINGS INCLUDED FOR AUTO VENT OPTIONS MOST TRUSTED OEM BALLAST BAG ON THE MARK