Check the listing for details. 100Pc Adjustable Emitter Dripper Micro Drip Irrigation Sprinkler Watering System. Condition: New. Listed at 19.37 USD. PROFESSIONAL QUALITY(100-PACK) - 1/4" Inch Universal 360 Degree Drip Emitter On 6" Stake - Adjustable Flow 0-18.5 GPH Fit 1/4 (4-7mm) Drip Irrigation Tubing - Professional Grade Drippers for Drip Irrigation 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: 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.DESIGN: Barb design ensures tubing will not slip out or blow off at high pressure and temperatureECO FRIENDLY: Provide water directly where you need it without any overspray!EASY TO INSTALL: Install emitters directly into the 1/2 main line or branch off with 1/4 inch tubing and connect fittings to the ends!