Hydro-Rain Blu-Lock® 37681 1" x 20' SIDR 15 Straight Pipe 100PSI - This Straight Pipe is constructed of environmentally-friendly, recyclable HDPE that provides a superior alternative to PVC. Its patented "push and go" design cuts installation time in half. The outside diameter (OD) technology ensures lower friction loss for better efficiency. Glueless, tool-free installation protects the environment and the long-term health of your crew.