Pair of 0.5'' airline polycarbonate bowls for compressed air tools,150 psi

Pair of polycarbonate plastic moisture / sediment bowls for industrial compressed air lines. They measure 4" high and 1.625" across the base. They are rated for 150 psi (pounds per square inch) or 10.3 BAR. The threaded ports are for a .5" air line. They are marked with marked with a directional arrow for direction of air flow. We didn't see a maker's name.