Sinister Diesel Coolant Reservoir Cap 17-23 GM 6.6L Duramax L5P PUT-402621BPFD providing the necessary flexibility to

providing the necessary flexibility to adapt to different mounting positions while maintaining durability over the long term

if you return a three turn gearbox as your core

The Alpha HD Airbag Kit is perfect for DIY'ers

Pre-set check valve at 18psi

Sinister Diesel Coolant Reservoir Cap 17-23 GM 6.6L Duramax L5P PUT-402621BPFD providing the necessary flexibility toFrustrated by the fragile plastic reservoir cap on your Duramax? Time to bite the billet and upgrade to Sinister Diesel's billet cap. The Sinister Diesel Coolant Reservoir Cap for your L5P Duramax is a high quality replacement billet cap designed to replace your factory cap. Made from high strength billet aluminum, this cap is build to last and withstand the rigors of daily use. The cap is precision machined to fit perfectly and ensuring a tight and