There are O Ring kits that have bulk material in them and then you simply cut to fit.
An example:
https://www.zoro.com/value-brand-st...gclid=CM6I1enGic0CFYaTfgod9Q8MIw&gclsrc=aw.ds
Replacement material is available.
Hobo
An example:
https://www.zoro.com/value-brand-st...gclid=CM6I1enGic0CFYaTfgod9Q8MIw&gclsrc=aw.ds
Replacement material is available.
Hobo