OTC 6525-1 100 PSI Preset Pressure Regulator Go to amazon.com Related posts Top 10 recommendation car vacuum leak smoke for 2019 Feature100 PSI preset nitrogen pressure regulatorFor use with number 6521 or number 6525 DescriptionOTC 100 PSI Preset Pressure Regulator 100 PSI preset nitrogen pressure regulator for use with number 6521 or number 6525.