Delivers precise amounts of water to individual pots. The WPCJ pressure compensated no-leak dripper is ideal for longer runs, when irrigating on slope, or when absolute precision of water volume to each pot is required. The WPCJ's "no-leak" feature stops dripping when the pressure on the main water line drops. All of the drippers on the line start and stop at the same time, leaving the line full of water for the next irrigation. .5 GPH flow rate, a 20 PSI pressure regulator is required for proper operation. Choose either the red plastic weight or the angle barbed stake to complete the installation. Perfect for hanging baskets, nursery crops, potted plants.