The Watts 3510-0808 3/8-Inch CTS by 1/2-Inch NPS Plastic Female Connector allows for efficient repairs and installations without the use of tools. Made of a high-performance plastic fitting product called polysulfone, Watts AquaLock Plastic fittings are designed to be trouble-free for years. Corrosion-resistant teeth allow the connectors to intersect with multiple materials without special tools or tube inserts. A locking clip and zero-leak O-ring guide provide connection security. Fitting rotates under pressure, making it ideal for vibrating and dynamic applications. Includes 25-year limited warranty. From the manufacturer: Unlike barb fittings, this product joins tubing on the outside to boost flow capacity. The patented O-ring guide ensures zero-leak connections by correctly aligning tubing, protecting the O-ring from damage and boosting side load capacity.