These thru-hulls are made with a durable, thermoplastic construction which prevents electrolysis. 
Caution: Thru-Hull connectors are designed for installation above the water line only.

Fits Hose Size : 1-1/8" to 1-1/4" I.D.

Max. Hull Thickness : 1-1/4"

Flange Diameter : 2-1/4"

Installation Hole Size : 1-3/8"

Material : Polypropylene