There should be couplers/connectors that go with the pex. I got a 1/8" drill and drilled through the pex and the coupler and used a 1/8" rivet to hold it together. Then I wrapped the connection with a bit of tape (strong packing tape or vinyl tape) and taped the hoop like normal.
The rivets stick up a bit but not enough that I really notice. It makes the tape over them look a bit strange, but I think I'm going to get an exacto knife and cut the tape around the rivets so everything is taped smoothly but it's not weird over the rivets. I have no idea if that last sentence even makes sense....
If you haven't ordered yet, this site - http://hoopsupplies.com/ just got polypro tubing in. I absolutely love the concept of this store - you can by a kit for $25 which provides you with the amount of tubing you need, tape and connectors. Saves you time and money sourcing out the supplies from all over the place.
They also have a facebook page and give away free hoops about once a month!!
Due to our most recent arrival... large coiled 3/4 OD polypro we now have pricing that is stiff competition to USP... and we sell in lengths from 1 ft to 100 ft. :)
To check out the new options & the new prices... and the fabulous large coil pro...
a hoop supply company that's by hoopers... for hoopers!