One O-Ring fits into a groove on the inside of The Gleco Trap to provide a tight, leak-free seal.
It is very important to smear a bit of petroleum jelly on the top rim of the bottle each time you put a new bottle on (or when you empty and reinstall the same bottle) to lubricate the O-Ring. This prevents the O-Ring from stretching and pulling when you tighten the bottle.
If you don’t use the petroleum jelly on a regular basis, the O-Ring loosens and can cause small leaks unless replaced.
Two O-Rings come standard with each Gleco Trap Package (one already installed plus an additional O-Ring). The package of 12 replacement O-Rings sold here only need to be purchased if you’ve already deformed the original two O-Rings.