129107-44590 Coolant pressure (radiator) cap

129107-44590 Coolant pressure (radiator) cap (smaller type see below for details)

Fits many Yanmar engines including the following ranges:
3JH2
3JH3
4JH2
4JH3
4LH
6LP
6LY

This is the small size cap Yanmar use rated @ 0.9 kpa
Approximately 46mm diameter