Castle Nut Lights it is REQUIRED to use

it is REQUIRED to use anti-seize on the thread to prevent binding and seizing

Best for: Replacement flame arrestor during service

Buckled towels stay put

or maintenance where a dependable seal and easy installation matter

Supports optimal engine performance and fuel efficiency

Castle Nut Lights it is REQUIRED to useThis 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