Forespar 906013 Mushroom Head Thru-Hull with Screen, 3/4"
Forespar thru-hull connectors are precision molded in high-strength non-corrosive Marelon . Their great strength, light weight and complete freedom from corrosion and electrolysis make them ideal thru-hull connectors for use above or below the waterline.
Features: Lightweight, yet extremely strong injection-molded parts
Completely free from electrolysis or reaction to any metals - no electrical bonding required
Completely free from any corrosion
Minimal maintenance requirements - requires periodic lubrication
Long term reliability
Specifications: Length: 2-1/4"
Answer: Threads do go all the way. 3/4" is the OD of the threaded section so that is the size hole you need.
Forespar Products Corp. warrants all products manufactured by it to be free from factory defects in material and workmanship under normal use and with normal maintenance for a period of thirty six 36 months from the date of initial retail sale. The Limited Warranty is extended only to the original retail purchaser and does not run to any subsequent purchaser. Proof of purchase is required.