1079 - 4 Pc. Universal Radiator Test Adapter Kit Kit includes pressure tester connector with 3 adapters to fit almost all cooling systems.3 adapters cover all diameters from 17mm to 40mm.Elastomeric adapters with wide durameter ratings.All adapters with O-rings.Connector works with all standard pressure tester pumps.Connector manufactured from aluminum, steel & durable plastic 1079