VTR Double Seal Inflate Through Valve Cap (4 Pack) High quality double seal inflate through valve caps (4 Pack). Save time and money over common valve caps by reducing pressure check times by 65%. Designed for high pressure truck tire service. Inflate, deflate or gauge directly through the valve, saving time. Tough all metal housing with durable self sealing O-ring. Grooved at the top (Not Threaded) to accommodate various lock on air chucks. Does not require an additional cap. Effective length 3/4". Installation torque 1.5-3 inch pounds. Knurled edges may vary in two or 3 rows.