Fits: Standard-size radiator filler necks, including Moroso Nos. 63420, 63465, 63466, 63467, 63485, 63486, 63650, 63651, 63656, 63730, 63740, and 63745

• Available with low and high pressure raitings to accommodate the needs of all cooling systems
• Steel spring maintains accurate pressure setting over time
• Six-sided Cap for easy tightening