Duotight Food Grade Plastic (Push-In) Bulkhead - 1/2" NPT X 3/8" (9.5mm)
Use this Duotight Push-In Bulkhead with your 1/2" NPT hardware. The total length is 1 1/2", so you can use it with kettles and coolers that have a pre-drilled 7/8" hole and a maximum wall thickness of 1/4".
This food-grade plastic Push-In Bulkhead can withstand 100 PSI.
In order for the dual EPDM O-Rings to give you the best possible seal, you should cut your 3/8" OD (9.5mm) EVABarrier & Polyethylene Tubing straight.