An auto drain feature is standard
At FluidAirFittings
the FT Pro tubing is a practical choice for your air product needs
Brass Female Hosetail 60 Degree Coned Seat BSPP With Swivel Nut
Parker Rectus 3/8" BSPP Female Plug 45SFIW17SXN An auto drain feature is3 8" BSP Parallel Female Plug, Mild Steel, Case Hardened & Nickel Plated, Series 45KF, Water, Pneumatic Quick Release, Non Valved, Brass and Steel, Working Temperature 20C to +100C, Maximum Working Pressure 150 bar, Parker Rectus Interchangeability: Hanson, Parker ST Series. Material: Steel, Nitrile Seal. Application: Straight Through Coupling, Maximum Flow, High Pressure Water and Steam Washers.