TH Marine Cockpit Deck Scupper Drain Cockpit Scupper Drain with check ball inside stops water from backing up into boat. High strength and UV stabilized to provide value and durability. 90 fitting connects to 1-1/2 hose, installs with four #8 screws (not included). Top flange is 3 5/8" diameter. Requires a 2 1/2" diameter hole for installation. Made in the USA!