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Zurn Pex hy-PE-RTube polyethylene raised temperature resistance (PE-RT) tubing is an alternative to cross-linked polyethylene (PEX). Its main advantage for installers is greater flexibility, which allows it to lay flat during installation. It also has a five-layer construction — inner and outer PE-RT layers and an ethylene vinyl alcohol core surrounded by two adhesive layers — that prevents air infiltration, protecting cast-iron boiler elements from rust. Cost is competitive with PEX, or around $26 to $31 per foot for 1/2-inch tubing.

Zurn Engineered Water Solutions, 800/872-7277, zurn.com.