Rain Bird A8860020 PSIM20 30 PSI Pressure Regulator for 2-22 GPM are recommended for most operating conditions. Each Pressure Regulator features a ¾” female NPT threaded inlet and outlet that works with ¾” male NPT adaptors and sprinkler products. This rugged series is designed to withstand surges up to 100 psi greater than the rated outlet pressure and provide years of worry-free operation. For use in above ground and below ground applications.