Fuel Tanks

3.75 Inch Locking DEF Tank Cap By TPHDSecure your Volvo's DEF system with the TPHD Locking DEF Tank Cap, a high-quality replacement designed for durability and reliability. This locking DEF tank cap features a 3.750-inch major diameter and a 2.290-inch...

Diesel Exhaust Fluid Filler Cap By TPHD Fits Kenworth & PeterbiltThe TPHD DEF Filler Cap delivers durable, long-lasting protection for your DEF tank on Kenworth and Peterbilt trucks. Designed with a 2.910-inch major diameter and 1.500-inch minor...

Diesel Exhaust Fluid Cap By TPHD Fits Mack & VolvoProtect your DEF system with the TPHD DEF Cap, designed to replace Mack and Volvo OEM numbers 21148728, 21148722, and 16MF51M. Sold individually, this high-quality cap provides a tight seal to safeguard...