Dura flexible coupler is made of flexible PVC. It is designed for outdoor use and allows you to easily go over bumps and tree roots and around corners. 1/2 in. Flexible Coupling 18 in. length Do not exceed 150 PSI Outdoor Landscape use only Constructed from flexible PVC Not to be used in hot water applications Designed to be used underground Non-Potable Not to be used in constant pressure applications