Forespar transom drain and plug assembly to fit up to 1-3/4" (44.45mm) thick transoms. The white garboard drain has an all Marelon construction to ensure years of corrosion-free use.

Diameter of the flange 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.