My GW Sailfish 282 is a 2004. Original drains were badly worn. Researched on this forum what other guys did to replace them. Seems access is very difficult without cutting a hole and adding an inspection port.
There were suggestions to use an insert shower drain. I was able to locate a perfect fit at local plumbing supply. The new shower drains are made of chrome plated brass. I took a Dremel and lightly sanded the inside of the old drain. Bedded the new drains in Lifeseal, used a Needle nose plier and they screwed right in tight. It was like they were made for it. A rare quick simple OMG moment working on a boat.
OceanBean
2004 282 with F250