- WFS APPROVEDCOMPRESSED AIR FILTER,1/2" NPT STANDARDGCEBP36JN51Call for PriceAvailability: Special OrderINGERSOLL RANDAIR REGULATOR,1/4 IN. NPT,59 C FM,250 PSIGCAROR37121-600Call for PriceAvailability: Special OrderINGERSOLL RANDAIR REGULATOR,1/2 IN NPT,210 C FM,250 PSIGCAROR37341-600Call for PriceAvailability: Special Order