I'm going to finish the lower level of our townhouse. The house is plumbed with AquaPex tubing and fittings. When I get to roughing in the new bathroom can I cut into the existing system using PEX tubing and crimp fittings that I can get at Menards or Home Depot?
Aquapex is a Wirsbo (Uponor) product. Wirsbo fittings are not the same as fittings for other brands of PEX. My house is done entirely using Wirsbo tubing and fittings, however I cannot obtain Wirsbo fittings at Home Depot, I have always gone to my local plumbing supply shop. It is possible that other brands of fittings will work with Wirsbo tubing, as it may be that the tubing itself is standardized, but perhaps a plumber on this forum with specific knowledge of fittings and PEX can chime in.
I have the special Wirsbo expander tool for PEX, it works very well, but costs about $300. Other fittings use different tools, they may be less expensive, but I have no knowledge of how well other fittings work. You may want to check out the current lawsuit against Zurn for failure of their brass PEX fittings, I always use the plastic Wirsbo fittings.