Which brands are associated with PEX piping?

The correct answer highlights brands that are well-renowned for their association with PEX (cross-linked polyethylene) piping systems. Nibco and Uponor are recognized manufacturers specifically involved in producing high-quality PEX piping and associated fittings. Nibco is known for offering a variety of plumbing products, including PEX solutions, while Uponor is a leader in the PEX industry, well-regarded for its innovative plumbing and heating systems.

Selecting this option reflects a strong understanding of the industry's key players in the PEX market, aligning with the requirements of a WQA Certified Service Technician, who must be familiar with the brands and products pertinent to their service scope.

Other choices contain brands that may not primarily focus on PEX piping, which is why they are not as suitable in this context. Some may offer plumbing products, but they do not have the same level of recognition or specialization in PEX systems as Nibco and Uponor.