It's a barb fitting for small hoses to connect them together. You can get them in all shapes and sizes. I have some for supplying water to some hydroponic garden boxes I made from Rubbermaid containers. The larger ones just look like plugs.
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Thanks for the conciser answer @stephen.king989. I can put my wondering to rest.
I'd love to see a picture of your hydroponic garden boxes.
those are pieces i have bought to connect drip line to direct irrigate as well as repair broken or severed drip hose. they may even be the brand rainbird!
Niiiice!!! It seems we have a consensus on this one! Grateful for those who know @duncan40.