Perko Thru-Hull Connections are cast bronze. Flange is machined to fit hull and grooved to retain bedding compound. Neck is threaded to approximately 3/8" from flange. With flange nut. Pipe size and maximum hull thickness given below. PKO available while supply lasts.

Attwood Thru-Hull Connectors are molded of rugged plastic. Will not rust, corrode, discolor or contribute to electrolysis. Design eliminated hull streaking and allows countersinking wherever a flush fit is required. Maximum hull thickness is 1-1/4". to retain bedding compound. Neck is threaded to approximately 3/8" from flange. With flange nut. Pipe size and maximum hull thickness given below. PKO available while supply lasts.