1/8" M to 1/8" F Check Valve, NPT (O.D. 16 mm)
This combination does not exist.
Check valves allow air flow in a single direction and prevent air flow
from the opposite direction. This check valve is an 1/8" NPT (M) to
1/8" NPT (F) with 16mm outer diameter. Properly sealed, recommended
torque for 1/8" is 10 ~ 11 ft. lbs.