Haltec DS-1 | Double Seal Valve Cap - 50 Pack haltec The R-520 is designated at

The R-520 is designated at Tire and Rim as the CH-8

Can be used for nitrogen or TPMS

Tread Depth: Up to 6″

These valve stems work great on trailer tires as well

Dimension: 3 1/8" x 5/8" (70mm x 16mm) Sold as Box

Haltec DS-1 | Double Seal Valve Cap - 50 Pack haltec The R-520 is designated atHaltec DS 1 Double Seal Valve Cap 50 Pack Designed for high pressure truck tire service. Inflate, deflate or gauge directly through the DS 1 dual seal valve cap to save time during inflation and pressure checks. Automatic inflation systems lock right onto the DS 1 valve cap. Seals like a high pressure cap, yet offers the convenience of an inflate through extension. The DS 1 performs like a check valve seal becomes tighter in the event of core failure.