Connect CGA-580 nitrogen / beer-gas cylinder valve to CGA-320 CO2 cylinder valve
How to join 0.965"-14 NGO RH and 0.825"-14 NGO RH, and what stops it leaking.
Not compatible. CGA-580 nitrogen / beer-gas cylinder valve and CGA-320 CO2 cylinder valve do not share a mating thread, so there is no adapter between them; fit the part that matches your hardware.
The two ends
- End A
- CGA-580 nitrogen / beer-gas cylinder valve (0.965"-14 NGO RH)
- End B
- CGA-320 CO2 cylinder valve (0.825"-14 NGO RH)
- A seals on
- nylon or fibre washer inside the nut against the valve outlet
- B seals on
- nylon or fibre washer inside the nut against the valve outlet
- Part needed
- matched replacement, no adapter exists
The part to buy
CGA-580 (nitrogen, argon, beer-gas) is 0.965-14 NGO and CGA-320 (CO2) is 0.825-14 NGO, so a CO2 regulator will not screw onto a nitrogen tank and a nitrogen regulator will not screw onto a CO2 tank. The two are deliberately different sizes; there is no everyday adapter, you fit the regulator for the gas.
The larger CGA-580 thread is a safety feature that stops you feeding nitrogen where CO2 is expected. Do not chase a cross adapter to force it; buy the CGA-320 regulator for CO2 and the CGA-580 one for nitrogen or beer-gas, and label the cylinders.
Related connections
Sources: CONCOA CGA fitting reference chart (CGA-320.825-14 NGO RH, CGA-580.965-14 NGO RH, CGA-590 LH) · MoreBeer / Taprite dual-gauge nitrogen (beer-gas / argon) regulator: CGA-580 inlet, 5/16 barb outlet · CGA-320 CO2 cylinder valve outlet thread reference (0.825in-14 NGO, RH) · CO2Art guide to cylinder connections (CGA320, W21.8, DIN477, BS341, G5/8, TR21-4)