The 3/4" (.940) compression end cap with flush valve is used at the end of the 3/4” (.940 OD) drip tubing or drip line. The flush valve is used for automatic flushing of the drip line at the beginning and the end of each irrigation cycle. At the start of each irrigation cycle, when reaching 0.6 GPM, the flush valve closes, and when pressure drops below 1 PSI the valve opens.