GROCO Thru-Hull Installation Tool [THT-530] Marine Plumbing & Ventilation | Accessories Top bulb ML-2 Bottom Bulb

Top bulb ML-2 Bottom Bulb ML-1 & 2

It won't add much weight

Improved in almost all aspects

12 Volt Bulb (Included)

GROCO Thru-Hull Installation Tool [THT-530] Marine Plumbing & Ventilation | Accessories Top bulb ML-2 Bottom BulbThru Hull Installation Tool Thru Hull Installation Tool The Concept: THT 530 makes the installation of standard GROCO thru hull fittings possible by a single installer. Slide the thru hull fitting, flanged end first, over the tool. (It will stop at the proper step.) Tie a length of monofilament to the eye and place it into the already cut hole in the hull of the boat. Apply caulking to the flange of the fitting, and pull the fitting through the hole