Castle Nut Lights Indmar’s waterproof marine grease is

Indmar’s waterproof marine grease is virtually waterproof

Installation typically requires careful alignment and a clean

Best for: Replacement flame arrestor during service

or maintenance where a dependable seal and easy installation matter

Supports optimal engine performance and fuel efficiency

Castle Nut Lights Indmar’s waterproof marine grease isThis marine grade brass castle nut is built for inboard prop shafts with a 1" to 1 1 8" diameter using 3 4" 10 thread pitch, a standard on many Malibu and Axis boats. Its castellated design allows a cotter pin to lock the nut in place, preventing vibration related loosening and securing your propeller to the shaft. Machined to precise standards and resistant to corrosion, this nut is essential for propeller retention in both salt and freshwater