The Pressure Relief Valve prevents a pressure build-up from occurring in systems with water, air, or oil.
Features:

• Brass Construction
  
• 1/2" MIPT Run
  
• 1/2" FIPT Branch
  
• Preset to 75 psi
  
• Adjustable +/- 25 pounds
  

Instructions: To adjust the pressure relief valve, unscrew the dust cap. Then you will find a slot for a screw driver. One full turn clockwise will increase the PSI by 25psi. One full turn counter-clockwise will reduce the PSI by 25psi. Once the adjustment is completed, replace the dust cap.