SUCOHANS 100 peices Mushrooms Self Healing Rubber Injection Ports,13mm Rubber Bottle Stoppers, For Sealing 1/4 inch or 7mm opening, Steam Sterilization safe

Quality of item is as described

As Advertised

Great self healing.

Work as they should. No manufacture defects. Good value.

Order was prompt on arrival. They do fit a 1/2 hole but I wish they would fit a little snugger because a few came out easier than I thought they should. I did try 2 different drill bits to see if that would make a difference. Over all they are good.

Sturdy and easy to use.

These are perfect for Mycology. Price is great!

I was using RTV Silicone for my liquid culture before, but recently the needle actually pulled out the plug, and contaminated the culture :(So I ended up springing for these. They don't have a notch on the backside like I hoped, so they don't look like they would hold in place.But after drilling a 1/2" hole, pushing it through, it did expand on the other side, and seems to be snug enough to not pull out with the needle. + much nicer looking than the RTV (and easier to find where the needle goes).I'll update if it does end up pulling out, but so far so good!