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All of the full transom Whalers of the late 80's, 1987-1990 had those emergency water evacuation drains, installed at floor level. Remembering that these hulls were initially designed as cut transom models, by filling in the "cut/notch", the way to quickly get a large amount of water out of the boat was gone. So the floor drains were put in, usually going both through the splashwell dam and the transom itself. Only the Sea Drive or full inboard versions had these Salisbury flappers. On the Whaler Drive models, the drain is concealed behind the Whaler Drive unit, and the PVC is left uncovered, since the Whaler Drive unit prevents most of the back flow into the boat.

My full transom 25, ordered as a Sea Drive Blank model for intended installation of an Armstrong bracket as an alternative to a Whaler Drive unit, also has these, done with 3" OD PVC pipe. If yours has 2-1/2" piping, it is aftermarket, which is obvious in the way it is cut off. I would buy some 3" OD pipe, and glue it over the smaller pipe, then install the 3" exhaust flappers. You can see my factory installation here:

http://smg.photobucket.com/user/lgolt...6&o=14

Regarding the Armstrong bracket on your boat, just by looking at the photos I can tell that whoever installed it didn't know what they were doing. It is installed way too low on the transom. Clearly your boat left the factory as a Sea Drive model, which engines were removed, the transom re-worked and filled in, and the bracket then installed. A deep hull like the 27 Whaler requires twin counter rotating 30" engines, which is how the conversion should have been done, and which would place the bracket higher on the transom, to keep engines drier, provide better performance and better appearance, etc. The clue is that the the top of the platform appears to be at water level, a bad detail. This also indicates they purchased twin 25" engines rather than the 30" engines that should have been purchased, assuming the conversion was done after 1992, when 30" engines first appeared for the 225 and up hp engines, all brands.

Here is the part you want:

http://www.foreandaftmarine.com/SB-EG...-EG300.htm

Sierra (a Sea Star Solutions company) evidently took over the Salisbury company. I also notice they have a less expensive version by Sea choice.