You simply push PEX pipes and fittings together rather than gluing (PVC and CPVC), soldering (copper) or screwing them (galvanized steel). Here are the fittings you're most likely to need when ...

Grip the copper pipe firmly in one hand and tuck one end under your knee to keep it from slipping while you tighten and rotate the cutter. Clamp the pipe between the cutting wheel and the guide ...