Will these caps fit my valve stems?

These are standard round-top caps designed for most metric and domestic valve stems. Test-fit one before installing all four to confirm your valve opening size.

How do I keep them from getting lost?

The dual-grip design grips the stem firmly — they won't fall off during driving or tire rotations. Keep one spare set in your glove box just in case.

Do these need any prep or installation?

Screw them on hand-tight. No tools, no prep. If your valve stems are dirty, wipe them clean first so the caps seat properly.