Originally Posted by yardsale
I understand that PEX is used for construction. Are the joints "compression" or "sharkbite" fittings?
I think it's pretty rare to find the o-ring sealed fittings (such as Sharkbite) except in repairs and retrofits. Any factory installation (like original building construction) typically uses less expensive, less bulky, and more reliable connections with clamps over barbs (or in the case of some PEX connections now, the PEX is just stretched over a barb); compression fittings are a more expensive but solid option that is used mostly with valves or other fittings that may need to be changed later.
This looks like a decent explanation: PEX Information