3/15

What About PEX vs. CPVC?

A PEX supply and CPVC cost about the same. But there are a few reasons why PEX may be a better choice. First, a PEX doesn’t require glue, which means you don’t have to work in well-ventilated spaces or wear a respirator. PEX is less likely than CPVC to burst if it freezes. Also, since PEX is more flexible and available in long lengths, it can work better for ‘fishing’ through walls in remodeling situations.

4/15

Do I Need Special Tools?

Yes. When plumbing with PEX, you can use stab-in or compression fittings to make the connections, but they’re too expensive to be practical on large projects. Connections for most PEX supply jobs require a special tool. There are several PEX supply connection methods, but only two 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 is that you’ll need either separate crimping tools for one-half inch and three-quarter inch fittings, or a universal tool with a swappable insert (not shown).

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.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.

5/15

How Do I Splice PEX Fittings Into My Existing Pipe?

There are several methods. The easiest is to cut out a section of plumbing pipe and slip in a stab-in tee (left). SharkBite is one common brand of stab-in fitting. This method doesn’t require soldering, which can be a big time-saver. But check with your plumbing inspector if you’re planning to bury this connection in a wall or ceiling. Some areas don’t allow stab-in fittings to be concealed. Another method is to solder in a tee and a PEX supply adapter. Then slip the PEX supply tubing over the adapter and attach it with your chosen connection method (right). You can also use a stab-in tee to connect PEX fittings supply to CPVC. Read the label to find the compatible fitting.