Rubber Grommet 1/2 Inch, Hydro Rubber Grommet Donut Type to make Waterproof Seal in DIY Hydroponic Systems and 16mm or 1/2 Inch Barbed Elbow Tee Straight Y Connector and Vinyl Tubing (Pack of 25)

High quality and fits perfectly. Exactly what I needed for my hydroponic buckets. Worked as described and great price!

I thought 1/2 inch meant it would work for 1/2 inch PVC pipe, like a uniseal. The hole in the center of these is 3/8 inch and will stretch to 1/2 inch. Turns out this will work for me. I tried a 3/4 inch mounting hole and a 7/8 inch hole and with the 7/8 hole, my 1/2 inch barbs get a tight fit.

Awesome

This is a great product. It made setting up a flow thru hydro system so easy to construct. Just drill a whole in a pail, insert the grommet, the barbed connector and attach the hose. Simple and very cost effective.

Good product just be careful about size. Measure the outside diameter of the pipe you will insert into the grommet then get that size. Example 1/2” PVC is 3/4” outside diameter.

The grommets worked as advertised. I used them in my hydroponic setup to put the drain in the 3" pvc pipe I used for my net cups. After drilling the proper sized hole . I inserted them with a twisting motion and was able to install my small drain line for the return of the fluid to the fluid tank.Would buy again when needed.

Using in green house setting for hydrophobics water continuous circulation

I took another reviews suggestion and got a 3/4 inch bit. I used a hole saw. Another reviewer mentioned a 13/16 bit would work too but I just went with the 3/4 and it worked just fine. This is a small tote for the record.