Drip blank distribution and emitter tubing dimensions vary according to manufacturers. Universal Drip Fittings are designed with an insert barb and outer collar which ensure a tight connection across a range of 1/2-in. tubing with outside diameters from 0.63 in. to .71 in. This makes them especially useful for repairs of non-Orbit drip systems. The barb and collar design make it possible to remove and reuse the fittings. For Orbit and all other .7-in. tubing from major manufacturers, we recommend Drip-Lock® fittings because of their ease of insertion and release. For outdoor irrigation use with cold water only.