I've used PEX bend supports in the ½" size before which worked great, but trying to use them for ¾" has been difficult. Regardless of the method I've tried, the plastic ones keep snapping.
Using the bend support itself as a lever to bend the PEX is definitely wrong, it breaks right away.
But even bending the PEX first by hand into more-or-less the right shape, and then inserting into the bend has caused many of them to snap & break.
This is PEX-B which is rather stiff. But I am trying to bend it in the direction it was coiled in. I'm working in a basement which is usually 50-55 °F all the time.
Is there some particular method of doing this right?
(I've also tried metal ones which don't break but refuse to stay on the pipe. But that's a separate problem).