No new seats are made for the 220da. Can only replace covers or retro in replacements. Search Google for 220da, then go to images, lots of pics with different seats.
Tank should be part of the toilet. Bottom half. Can remove it to empty or if a pump-out hose is attached, pumped out. If you look in the engine compartment you should see the line and shut0ff exiting out the hull.
Our 220 DA doesn't have a holding tank. as andyr said. Just the porta potties holding tank. The hose connection to that can be used to suck out tank or with macerator pump.Overboard Waste discharge lever is located on starboard side in front of engine.
220DA is a great boat.. Easy to haul, plenty of room and easy to maneuver. Fuel usage isn't near as bad as it's larger cruiser models. I really have no complaints about ours. I'm redoing everything on ours just to make sure it last us many more years. We had been looking at bigger Sea Rays and...
We have never been able to find any company that sells any canvas for the 220DA. Only option is custom made or repairs. Both being costly. Our tops are in good shape but a couple bad zippers. Zippers are expensive.
I run a 15x17 SS, boat tops at 34mph GPS. 4200 rpm, best GPH is running 24mph at 3300 rpms. Takes 9-10 secs to plane. But has 750 hrs. on it's 5.7 so it's getting tired a little. Still runs great and no smoke. Doing a compression test this spring to see how well she's doing. Spring is also...