The Antelco CETA pressure compensating dripper is made in Australia by Antelco, an Australian Owned company. This is one of the most accurate drippers available and with millions of units installed around the world, you can be sure that every Antelco CETA will perform accurately for years to come. You can even unscrew the cap for cleaning if necessary! Provided the water pressure is between 100 and 400 kPa, this dripper will give exactly 8 litres per hour. This is the bulk price for a bag of 50 drippers.