These pipe extenders slip outside 1½" pipe and inside 1½" pipe, making it easy to perform in-trench pipe extensions. They are made from PVC and are NSF 50 approved materials, ensuring that they are safe and durable for use in swimming pools. With this product, you can easily extend your pipes to the desired length without the need for any complicated or expensive procedures. It is a cost-effective and efficient solution for all your pool pipe extension needs. This pipe extender is perfect for those who have a pool with a 1.5 inch pipe and want to extend it without any hassle.