Although this design was developed and used by several RV OEMs, this design group of hydraulic cylinders was developed for the EQUALIZER SYSTEMS COMPANY for use in recreational vehicles that used light duty room slide-out systems. This design group comes in stroke lengths of 12", 18 1/2", 20", 25", 30", and 36", all based on a bore size of 1 1/8". The basic design is non-repairable, has #6 SAE O ring boss ports, A 3/4" piston rod, 5/8-18 threaded rod end, and the rear cap is threaded for a 5/8-18 bolt or all-thread.