Rain Bird BUE20-25S Drip Irrigation Button Dripper/Emitter, 2 Gallon Per Hour, 25-Pack Medium-high rate flow 2.0 gallon per hour button dripper/emitter Non-pressure compensating model Self-piercing design; use with 1/4" Drip tubing or insert into 1/2" or larger Drip tubing Large water passages and self-flushing action help prevent clogging Constructed of highly durable UV and chemical-resistant materials to assure long life 25-pack of dripper/emitters in convenient plastic bag