MALIDA ST-053A 1/4"OD PE Tubing Elbow Bulkhead Connector,Push to Connect Fittings,Quick Connector,Widely Used in Water Purification, RO Systems Food/Beverage System，5pcs.

Used these as through-the-wall water fittings at the bottom of the side on 5-gallon plastic buckets. This is part of an automated watering system for a greenhouse grow bucket setup. They installed very easily and don’t show any sign of leaking after a whole season of use.

I have included a few images of how I installed this small 1/4" bulkhead for a RO water reservoir. I am using a plastic tote for the water and it needed extra support on the sides. So I used two. I made a larger hole in the outside tub. Then for the actual bulkhead, I used a 9/16" bit for the hole. It's just barely the right size. That's exactly what I wanted so that I could use the threads to screw it into the plastic cresting a tight friction seal. My issue with these fittings is that they do not come with an o-ring. Personally, I feel safer with a rubber seal on the inside of the reservoir to keep it from leaking. I ended up using one I took out from an old garden sprayer. It's just the right size and created a tight seal. It was thicker than I would have preferred but there was still enough thread on the fitting to get the nut tight. That is my reasoning for deducting 1 star from my review. I hope this helps someone.