The Volvo 17256439 is a genuine OEM cap designed for the expansion reservoir in Volvo cooling systems. This essential component ensures proper pressure regulation within the cooling system, preventing coolant loss and maintaining optimal engine temperature. It is compatible with a wide range of Volvo construction equipment, including articulated haulers (A25F, A30F, A35F, A40F, A45G, A60H), wheel loaders (L110G, L120G, L150G, L180G, L220G, L250G, L350F), excavators (EC250D, EC300D, EC340D, EC380D, EC480D, EC700C, EC750D, EC950E, ECR235E, ECR305C), and various Volvo truck models (FMX, FH, FM, FE, FL, VNL, VNM, VNR, VHD, VAH, VNX). Measuring 95 mm in length and width, and 51 mm in height, with a weight of 0.12 kg, this cap provides a secure and reliable seal for the expansion tank.