Find wide variety of PEX fittings at Alternative Heating & Supplies. Shop the types of PEX fittings including expander fittings, crimp and press fittings and several types of push-pen PEX fittings. Lower installation costs and time with PEX fittings that are more flexible and durable than copper alternatives and need fewer connections resulting in lower labor costs. Ask us if you have any questions. Our goal is to provide the PEX tools and fittings you need to be self-sufficient and the technical know-how to help you use them.