GAS Shutoff vs JG4: specs compared
Updated 05 September 2026.
6
specs differ
GAS Shutoff and JG4 differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.
| Spec | GAS Shutoff | JG4 |
|---|---|---|
| Designation | 1/4" MPT x 1/4" MFL | 4 mm OD |
| Size / thread | 1/4" MPT (1/4-18 NPT) one end, 1/4" MFL (7/16-20 UNF) the other, often with a check valve | 4 mm OD tube |
| Fitting form | quarter-turn ball shutoff | push-fit collet, metric |
| Seals on | NPT end taped on the thread; MFL end on the flare face | single O-ring plus a stainless collet grab-ring |
| Rating / role | shuts a single gas line without touching the regulator; some carry a check valve too | John Guest Speedfit metric fittings for 4mm OD tube; tube OD must be within 0.1mm of nominal |
| Tube OD | 4 mm |
Questions and answers
How do GAS Shutoff and JG4 compare?
GAS Shutoff and JG4 differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.