The Watts RadiantPEX Plus (Model# PB032061-600) is a 600-foot roll of 3/8" diameter PEX-B tubing designed for radiant floor heating systems, potable water distribution, and hydronic applications. PEX-B tubing is flexible, freeze-resistant, and corrosion-resistant for long-lasting performance. Arrives in original packaging in like-new condition. A great value for contractors or DIYers tackling radiant heat or plumbing rough-in projects.