5-Pack (Same Size) Solid Rubber Stoppers - Size #7-37mm (1.45in) x 28mm (1.10in) - 30mm (1.18in) Long - Black Lab Plug

Like the title says I bought these to plug the ports on a pair of JBL studio 530s that I bought second hand. These fit great and stay in. They're solid rubber and feel solid.

Works great. Happy!

These solid rubber stoppers are indeed solid, and require some effort to push into and pull out of openings, but are a better fit for 30mm openings than #6's. These are made of very dense rubber and are impervious to wear and tear, and seal good if pushed in hard enough.

This corks like crazy. I use one of them to cork a thru hull under my sailboat. So far I have not sunk.Don't freak out, I have a closed seacock also protecting the thru hull.

The outback comes with crossbars that can be mounted differently. The holes left behind can get dirt and water in them causing problems later. So the #7 rubber stoppers fit perfectly to prevent that.

Just what I needed. Rubber is perfect consistency, not too hard or soft. Fit nicely to plug some ports for me.

I purchased these to help keep the insides of my brewing carboys clean between uses. These fight nice and tight, will not just fall out, but also not impossible to remove. Since all my drilled stoppers are white, this also provides a great color contrast so I know which ones are solid. I purchased another pack to make sure I had enough for every carboy I own.

Very poor quality. They did not look like something made in a modern production facility. Two of the five are totally unusable because they have cracks. I'm actually wondering if someone didn't accidentally pack rejects. Also, they didn't have the size stamped on them, which I thought was standard.