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DESIGN: Barb design ensures tubing will not slip out or blow off at high pressure and temperature SIZE: For use with any 1/4" Inch tubing size - 4 to 7 mm (Can also be punched into 1/2 drip tubing). PREVENT LEAKS & BLOWOUTS: *****USE 22 UNITS PER LINE AT FULL OUTPUT 25PSI RECOMMENDED***** These emitters are designed with an operating pressure: up to 25 PSI. If your system is over that number blowouts and poor performance will occur.