11238 Filter Regulator for O500 July 24, 2020 View cart “13430 Pump assembly rinse for G520” has been added to your cart. $222.00 11238 Filter Regulator for O500 quantity — OR — Add to Cart Category: Parts Description Resources Description The 11238 filter regulator is 1/4″ npt and set to 38 psi for use in the O500 (retired) paint gun washer. Related products 54P1 Plastic Nozzle $18.00 Add to Cart 1001441 Muffler for 338 Pump $22.00 Add to Cart 22GW Trigger Lock Assembly $68.00 Add to Cart 54 Brass Nozzle $18.00 Add to Cart