A few more years of working with irrigation have lead me to this conclusion:
Don’t use these compression tees to assemble your system. Not that there is anything wrong with them, but they take a lot more labor to install than the barbed fittings. The header tubing has to be cut to lengths, and each tee has to be forced onto a length on each side, which takes time and hand strength. Then you have to have a second fitting to join the drip tape to the tees.
Much better, in my opinion, are the barbed fittings. You just punch a hole in the header tubing and push the barb into it. The drip tape attaches right to the other end of the fitting and it’s done. No cutting and very little forcing. Very fast. Cheaper, too.
If you need to change the layout the following year, just buy a new roll of header tubing (100′ = about $15) and punch new holes. It’s a lot better than having to pull all the tees off, cut new lengths, and push the tees back on. If there are only a few changes, you can put goof plugs in the old holes and punch new ones.
So, anyone want to buy a bunch of tees?