1. The item shown on below picture is a “grease injector” (pos. 44). The grease injector scope of work is to connect the pump with the valve to inject grease in case of emergency. Please be informed that grease injectors with double check valves are not available on the market, as it will made difficult the injection of grease.
2. What we proposed you is a double check valve instead of a single check valve (pos. 40). The scope of the check valve is to avoid leakages from the greasing ports.