Duotight offers superior quality when compared to other push-in fittings. Their double EPDM O-ring design provides a more complete and reliable seal, protecting against leaks even when tubing is bent around tight corners. They are suitable for both beverage and gas applications, and are pressure rated to 100 psi. Tubing can be released by simply pushing in the collet and pulling the line out. No need for clamps or cutting lines!
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These fittings seal well and don't leak and are INCREDIBLY easy to use. Step 1: Get hose with hand. Step 2: Push hose into fitting. Step 3: You are done! Price is great on these and will save many headaches. Awesome stuff.
When I first started kegging (recently), I used some cheap vinyl tubing from Home Depot, but ended up with some awful flavors from it. I upgraded to Accuflex and this fitting, at the suggestion of many on Homebrewtalk.com. I love this fitting! I only wish there was something for picnic tap. I don't have faucets yet so I can only use a fitting on the QD end, which is easy as can be. I look forward to getting faucets so I can have these babies on both ends!
I cannot comment on the long term durability. However, having used all manner of insanity to put on accufelx bev-seal ultra, nail punch, boiling water, needle-nose pliers , I would not use bev-seal ultra again without these or the shank adapter. They literally just popped on. As for long term stability, we shall see.