11238 Filter Regulator for O500 July 24, 2020 View cart “21350 Pump assembly water side 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 Sparkle Clean (SC01/SC06) $59.00 Add to Cart 22GW Trigger Lock Assembly $68.00 Add to Cart 23K Manifold Adapter Kit $185.00 Add to Cart 13836 Outer Filter Bags $82.00 Add to Cart