Rolair CV4X4L1 is a brass inline check valve for air compressor plumbing, designed to prevent reverse flow in the line. It features 1/2" FPT (female pipe thread) connections on both the inlet and outlet and includes a 1/8" FPT unloader port for optional venting or unloading configurations. This model is listed by Rolair as CV4X4L1 and is referenced by retailers as the direct replacement inline check valve for Rolair compressors that use 1/2" fittings.
