Probably not needed for the waterer nipple as they each come with a grommet. But I ordered some just in case. Waterer nipple works great, no unwanted leaking.

I ordered a few extra in case some started leaking but never needed them. I keep a few around now just in case I make a change to the system and need to replace them!

I bought a few extra grommets when I ordered my chicken nipples, in case I messed up with installation. No problem installing them. So now I have some extras on hand if the time comes when I need to change them out into another bucket. Very satisfied with the grommets and chicken nipples. It was easy to make my own waterer for my girls, and I have no leaks upon initial installation!

I had to order some extra of these grommets because after I made the chicken nipple waterier from a Gatorade bottle, I decided to instead put the chicken nipples on the bottom of an old Coleman cooler. Had to cut the little rubber grommet to get the push-in nipples out of the hole I drilled, so had to order some for re installing them in the Coleman cooler. Tried Ace hardware first, but the 4.00 I spent there was useless... their little grommets didn't fit exactly, so glad to have the ones that do fit.

Good quality. Easy to install. Seals good.

Probably not needed for the waterer nipple as they each come with a grommet. But I ordered some just in case. Waterer nipple works great, no unwanted leaking.

I ordered a few extra in case some started leaking but never needed them. I keep a few around now just in case I make a change to the system and need to replace them!

I bought a few extra grommets when I ordered my chicken nipples, in case I messed up with installation. No problem installing them. So now I have some extras on hand if the time comes when I need to change them out into another bucket. Very satisfied with the grommets and chicken nipples. It was easy to make my own waterer for my girls, and I have no leaks upon initial installation!

I had to order some extra of these grommets because after I made the chicken nipple waterier from a Gatorade bottle, I decided to instead put the chicken nipples on the bottom of an old Coleman cooler. Had to cut the little rubber grommet to get the push-in nipples out of the hole I drilled, so had to order some for re installing them in the Coleman cooler. Tried Ace hardware first, but the 4.00 I spent there was useless... their little grommets didn't fit exactly, so glad to have the ones that do fit.

Good quality. Easy to install. Seals good.