This product features a 1½" MPT that threads directly into 1½" FPT, allowing it to keep the flow in a straight line, eliminating the problems of backflow due to twisted eyeballs. This is especially useful in commercial spas, reducing callbacks. This insert is great for in-floor foot jets and is manufactured from UV-resistant engineered polymer, ensuring its durability and longevity. Made in the USA, this product is a reliable and efficient solution for pool and spa builders and remodelers.