QR-4 Showing the single result Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low Sale! Wilkerson Regulator 1/2″ NPT Max. Pressure Rating 175 PSI – Model QR-8 $60.00 Original price was: $60.00.$35.00Current price is: $35.00. Add to cart