Thanks for your question.It's the first time we learn that 1/2 tubing is hard to get connect with fiitings. But we learned that 1/4 tubing is hard to conect with fittings before. If the tube is too soft, it would get much softer (which makes the connectors fall off the tube) outdoor in summer.So we improve the tube to make it harder. And then you need to put the tube in hot water for seconds (10 seconds or more) to make it easy to attach the tube to connectors. Or with a heat gun, blasted the end of the tube for 4-5 seconds and pushed it in with ease.Hope it can help you and best wishes for your gardening.