friction-fit cover
nounUK /ˈfrɪk.ʃən.fɪt ˈkʌv.ər/
US /ˈfrɪk.ʃən.fɪt ˈkʌv.ɚ/
A cover that stays on because it fits tightly and rubs against the thing it covers.
She pushed the friction-fit cover onto the jar until it stayed on by itself.
OTHER MEANINGS
2. A protective cap held in place by tight contact rather than threads or fasteners.
The friction-fit cover on the camera lens pops off with a gentle pull.
3. A removable shell on a device that grips the body through surface contact.
The phone's friction-fit cover snaps on without any screws.
4. A lid designed to seal by pressure alone, often used for storage containers.
Use a friction-fit cover on the paint can so it stays fresh.