Do I Need Special Tools?
No. You can use stab-in or compression fittings to make the connections. But they’re too expensive to be practical on large projects. For most jobs, you’ll want to invest in a special tool to make connections. There are several PEX connection methods, but only two that are affordable enough to be practical for DIYers: crimp rings and cinch clamps.
Crimp rings are a band of metal, usually copper, that you slip over the fitting and compress with a crimp ring tool. The main drawback to the crimp ring method is that you’ll need either separate crimping tools for 1/2-in. and 3/4-in. fittings, or a universal tool with a swappable insert (not shown). This adds a little up-front cost to this method. A combo kit with interchangeable crimp jaws starts at about $100.
Cinch clamps work more like the traditional band clamps you’re probably familiar with. You slip the cinch clamp tool over the protruding tab and squeeze to tighten the cinch clamp. The same tool works for all sizes of cinch clamps. Cinch clamp tools start at about $40. We like the one-handed version shown in the photo because you can hold the ring in place with one hand while tightening it with the other.
The only other special tool you need is a scissors-like cutter for the tubing.