Black Flexible PVC Pipe for Pools, Spas, Ponds and Water Gardens. 2 Inch ID (10 ft, 25 ft, 50 ft, and 100 ft). The inside diameter of sch. 40 pvc pipe is stated as a nominal figure, please see chart in photos for actual measurements. This means 2″ ID is NOT exactly 2″ ID. ALL manufacturers make this pipe the exact same way. It is very expensive, time consuming and aggravating to locate and replace a piece of pipe that failed. Flexible PVC Pond and Spa Tubing is made for use with Schedule 40 Fittings. Connecting is a breeze with any PVC Glue. Can be used for above or below ground installations. A Rigid PVC spiral resists crushing & impact. Less fittings required compared with rigid PVC pipe. Specially designed for use in the installation of pools, spas, water garden & koi ponds, & similar water transfer applications. Designed to be glued into Schedule 40 PVC fittings. Local pick-up IS available. Please make sure that you read the technical chart above to order the proper size pipe. If you have any questions, comments, or issues.