Proper installation requires fully inserting the copper pipe and pressing both sealing rings.
1/2" Press x 3/8" OD Compression Quarter Turn Angle Stop Valve, Lead Free (Chrome Plated)
| Finish: | Chrome Plated |
|---|---|
| Material: | Brass |
| Product Type: | Supply Stop |
| Size: | 1/2" x 3/8" |
| Inlet Type: | Press |
| Outlet Type: | OD Compression |
| Lead Free: | Yes |
| Type: | 1/4 Turn |
| Body Pattern: | Angle |

Hi Argos! You only press the bottom one further from the valve, you do not press the one closer to the valve body.
Hi Matthew. The side with the top raised ring (closest to the handle) has already been pressed onto the valve. The only press connection that needs to be made would be a single 1/2" press on the open end with the other raised ring.