Check the listing for details. John Guest NC932 15Mm Stem X 1/2" Barb Adaptor. Color: Grey, Condition: New. Listed at 59.16 USD. Upgrade your plumbing system with the John Guest NC932 15mm Stem x 1/2" Barb fitting, designed for reliable connections between 15mm tubing and 1/2" barbed hoses. Crafted by John Guest, a leading name in fluid handling solutions, this fitting ensures durability, ease of installation, and leak-proof performance. It facilitates a seamless transition from 15mm tubing to 1/2" barbed hoses, offering versatility and convenience for various applications. The John Guest NC932 15mm Stem x 1/2" Barb fitting is ideal for use in residential and commercial plumbing systems where a reliable connection between tubing and barbed hoses is required. It's commonly used in water filtration systems, beverage dispensers, and other applications. Upgrade your plumbing system with the John Guest NC932 fitting and.