Our HD series LBZ/LMM transmission cooler line repair kit is popular amongst customers looking for superior durability at an economical price. This is the only guaranteed leak proof cooler line service kit available in the aftermarket. These repair kits are designed to replace the failure prone rubber sections of your OE transmission cooler lines. Each DHD line section features high quality -10AN braided stainless lines with military grade crimps. Kits are pre-assembled and come with black AN compression fittings.