gasses -- compressed gas cylinder and tank information

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Disposable propane cylinder threads are usually 7/16th UNEF. In addition there is an automatic valve in the fitting activated by a pin inside the female fitting. Simply screwing a hose with a 7/16th UNEF fitting will not allow you to use the bottle. The fitting with both the threads and pin are called Type 1 or QCC-1 fittings. Don't expect even sales people to know this.

Medium cylinders use Acme threads Large cylinders (>40 pounds) use 1"-20 UNEF threads (called POL threads)

  • Outlet threads: 1"-20 UNEF
  • Inlet threads: 0.880-14 NGO-LH-EXT

1-5/16" Female Acme Inlet

1/4" male NPT