Tri-Loc™ drip fittings are a much more ergonomic alternative to traditional compression and insert barb fittings. Tri-Loc fittings also offer exceptional retention strength and are great for both new and existing systems alike. As the Tri-Loc name suggests, these fittings will fit the three most common dripline and drip hose sizes from most major manufacturers (16, 17, and 18 mm outer diameter).