The Excel PC series Drip line drip emitters with built-in check valve or non-drain device have a sealing pressure of 1.5 PSI to prevent water draining out when the water has been turned off and opening pressure of 4.3 PSI when the pressure turn on. This feature protects the drip line from siphoning small soil particles into the drip emitter, making it ideal solution for sub-surface drip installation
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