The Fisher and Western 56507 is a genuine bypass check valve assembly, an essential component for the hydraulic systems on a variety of snowplow models. It provides a fail-safe for the hydraulic unit and is compatible with numerous plows, including Western's Suburbanite, UltraMount HTS, and Pro Plus models, as well as Fisher's Homesteader, LD, SD, and HD series. This kit includes the necessary plug (part number 92960) and O-ring (part number 26784) for a straightforward installation, ensuring your plow operates smoothly and reliably.