HOF32-AA is designed to seal smooth outer diameters in the range of 0.433" to 0.512".This model features a port for filling or pressurizing the connected workpiece. Maximum working test pressures depend on surface finish of the part as shown below. Vacuum is acceptable for all surface finishes 35 PSIG max on 30 R sufaces 50 PSIG max on 50 R surfaces 75 PSIG max on 125 R surfaces