Stant 12704 Cooling System Pressure Tester Replacement Hose and Head Kit Stant engine cooling system pressure tester replacement Hose and head kit - does not include other kit components, i.e., pump, gauge, case, etc. Test kit replaces the standard radiator cap with specially engineered testing components Pressure testing can help determine the health of cooling system components and radiator/recovery bottle caps by revealing pressure dependent leaks or components on the verge of failure Capable of testing cooling system at up to 30 psi along with lower pressures - 17-19, 20 lbs. Includes spacer washer for 1 inch deep filler necks