The simplest product. A piece of pipe cut to size. The 1/2-3/8 had good "barbs" to grab the inside of the tubing on both ends. The 1/4-3/8 had good serrations on the 3/8" end, but the 1/4" end was a bit rounded and less defined. I tested both adapters with the EPDM tubing used for the syringe. Fits well, is not very difficult to put on and holds up satisfactorily when taken off 1/2-3/8. The 1/4" hose end was a little easier to install/remove than the 3/8 or 1/2" hose ends. I definitely recommend the 1/4" end clamps. I installed appropriate hose clamps and pressure lines up to 40psi; both adapters seal well. The hose is thicker than some of the cheaper adapters I've used, such as the copper adapters, from some are out of round. These adapters are more durable. Very happy with the purchase of the 1/2-3/8 adapter. If the serrations on the 1/4" ends were that well defined I would be just as happy with them. All in all I am happy with these adapters and they should serve well for many years.
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