A high pressure line lock which is an inexpensive manual alternative to electronic Roll Control line lock. When fitted to the appropriate brake line it allows pressure to be applied then held in line providing a hydraulic park brake facility. Featuring 1/8-28 BSP ports, to connect to -3 brake hoses select two 1/8 BSP to -3 male/male adapters and two 3/8" (10mm) copper crush washers from the associated products detailed left and then select any two AN -3 female hose end.