Presta valve extension o ring size

Statler

Using these: https://www.wiggle.co.uk/lifeline-valve-extensions-for-non-removable-vc-2pk-60mm

They use a very small rubber o ring that fits on top of the existing valve and ensures an airtight seal between the extender and valve. Problem is the o rings don't last so I need repalcements, just checking if A. anyone knows what exact size I need or B. anyone can suggest a hack/bodge around this. I do see mention elsewhere of using ptfe tape on the threads, not really sure what they mean but open to suggestions....

Thanks...

Mr. Cats

I have used ptfe tape for this and it works without issues (and I’m not handy!). The tape is really thin so you can wrap it around the thread. Then when you screw the extender on, the tape acts as a seal between valve and extender. It’s available in plumbing section of any hardware shop and is really cheap.

Statler

https://www.boards.ie/discussion/comment/120475725#Comment_120475725

Perfect thanks, wasn't sure what way the tape was used, or what it was, I was thinking more along the lines of electrical tape...

Wishbone Ash

https://www.boards.ie/discussion/comment/120476210#Comment_120476210

PTFE tape is way thinner than electrical tape. It would be a similar thickness to the little plastic bags at the vegetable section of supermarkets. In plumbing, it is placed over the threads before screwing on the nut, to create a tighter seal. It's usually applied in the thread direction.

iwillhtfu

Yep, PTFE tape for this one I've used it myself before no issue.

cletus

To make your life as easy as possible, make sure you wrap the PTFE tape in the same direction as the thread you're putting it on

Statler

PTFE tape it is then... Thanks all!