Indmar Fuel Pressure Regulator, 4 Bar, common on Malibu Boats 2003-2006 with the Pierburg fuel pump system.
Regulator used with Pierburg Fuel Pump and Malibu Boats GEN2 in-tank fuel pumps.
This is a mechanical regulator and the vacuum nipple is not used. Nipple is generally capped.
4 Bar = 60 PSI
Indmar Marine fuel regulator