For newer transoms, Forespar® designed a drain & plug assembly to fit up to 1-3/4" (44.45mm) thick transoms. Our Marelon® female 3/4" (19.05mm) elbows or female threaded barbed hose fitting can be screwed onto the end for hose attachments if needed. All Marelon® construction ensures years of corrosion free use.
Diameter of the flange (both ends) is 2 (50.8mm). Diameter of the body (female threaded unit) is 1 (26.1mm). This is the diameter of the hole needed to install the unit through the transom. Standard garboard drains come in black Marelon