This is Onestop's " DURAFLOW " series unloader valve, it is compatible with both our Hydronix series pumps. (This is also compatible with many other brand pumps, unsure? Just ask.)
What makes our unloader valves better than the rest? We use ceramic core parts and higher quality steel springs!
Our ceramic core ball bearing is much more resistant to wear and tear which ultimately causes premature failure and creates unnecessary stress to the other components within the valve.  
40LPM AT 250BAR
3 X 3/8" FEMALE PORTS
ALL OUR PRODUCTS COME WITH FREE DELIVERY