Product Guide
Domestic Water Piping
![](https://www.buildinggreen.com/sites/default/files/styles/product_guide_images/public/product_guides/ISCO_PP-RCT%201.jpg?itok=YZ3PBW0h)
Polystar CT-White and CT-Red contain an inner layer of fiberglass for added strength and insulation. The CT-Blue product has no inner layer, costs less, and is for use in ambient temperatures.
Photo: ISCO Industries, Inc.