SPECIAL ORDER ITEM. Review Returns Policy before purchase. The PEX Crimp 90 degree Elbow is a durable plumbing fitting designed to change the direction of PEX tubing by 90 degrees while maintaining a secure, leak-resistant connection. It is commonly used in water distribution and hydronic heating systems where tight directional routing is required. This fitting features barbed ends on both sides, specifically engineered for use with PEX crimp rings and crimp tools. When properly installed, the crimp ring compresses the PEX tubing over the barbs, creating a strong, permanent seal.