How it connects
Pull back the knurled sleeve, push the coupler onto the port until the locking balls engage the port groove, release sleeve. An O-ring seals on the port; turning the top knob (manual type) depresses the port valve core to open flow.
Male and female halves
This is the female half (coupler). The male half is the service port/fitting on the vehicle, which carries a valve core and protective cap.
Usually connects to
- R134a high-side service port (male, ~16 mm OD) on the vehicle A/C line
- manifold gauge / recovery machine hose, usually via 1/4" SAE 45° flare
Common sizes
- Single size per side: high-side port ~16 mm, low-side port ~13 mm (sizes differ so they cannot be swapped). Hose end typically 1/4" SAE flare (7/16-20), sometimes 14 mm x 1.5 metric; straight or 90° body.
Where it is used
automotive air conditioning serviceA/C recovery/recharge equipment
Variations
- manual (knob-actuated) coupler
- automatic/snap coupler
- 90° and straight bodies
- anti-blowback hose end
- R134a-to-R1234yf adapters
How to recognise it
Short cylindrical body with knurled spring sleeve at the open end, often red cap/knob marked HIGH or H; side or top outlet with 1/4" flare male or female thread. Open end shows an inner bore ~16 mm with a center pin to depress the port valve.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| R134a LOW side quick coupler | Low side is blue and smaller (~13 mm port); high side is red, ~16 mm. |
| R1234yf service coupler | R1234yf ports have different diameters/geometry and couplers are usually labelled 1234yf; they will not fit R134a ports. |
| R12 Schrader service port | R12 ports are threaded (1/4" and 3/16" flare style), not snap-on quick-connect. |
Also called
R134a high side quick couplerR134a high-side service couplerred A/C quick couplerHS coupler
Good to know
R134a service ports are commonly listed as 16 mm high-side and 13 mm low-side. A coupler can have a separate 1/4-inch male flare at its other end.
Related connections
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