Constructed of corrosion resistant investment cast 316 stainless steel. Designed to be used in conjunction with 1-1/2" ? 11-1/2 NPSM straight threaded pipe. All fills and replacement caps (except waste) include attachment chain. Installs with three #10 FH fasteners (not included). USCG regulations require bonding wire to prevent sparking. Type Water A 1-1/2" Pipe B 1-1/2" C 3-7/16"