The PG-SL-1R series of injec tors are suitable for single-line high-voltage centralized lubrication systems; it c an deliver grease up t o NLGI 2#; the displacement is adjustable; the indicator can visually observe the working status of the injectors; its modular design can realize the rapid disassembly and replacement of every individual part. Compared with PG-SL-1, PG-SL-1R has a different appearance.