It's all about the pressure! And drip irrigation requires low pressure--lower than most home faucets or hydrants provide.
While most emitter tubing and emitters for drip systems operate well with regulators rated at from 10-30 PSI systems with mini-sprinklers and misters operate best in the 20-40 PSI range; and Tape systems should operate within the 8-15 PSI range.) Regulators should be situated after valves or timers because they can be damaged by constant pressure. They are available with hose or pipe threads and male or female inlets and outlets.
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LAWN & GARDEN LOW VOLUME REGULATORS
An ideal regulator for low volume systems connected to
Maximum inlet pressure 120 PSI
Flow range 6-420 GPH
Female Hose Thread inlet x Male Hose Thread outlet
Use with Tee filters, Inline filters or Hose Threaded Y filters.
LOW FLOW REGULATORS
Flow range is 6-480 GPH.
Inlets and outlets are 3/4"
Maximum inlet pressure 150 PSI
Models 822 thru 824 below:
Female Hose Thread Inlet x Male Hose Thread Outlet for use with In-line filters or hose threaded "Y" filters
A low cost regulator that works like a limit valve.
100 PSI Maximum inlet pressure
30--420 GPH Flow range
Female Hose thread x Male Hose thread
Can be used with Tee Filter, Inline Filter or Hose threaded "Y" Filters.
THIS REGULATOR CAN BE USED BEFORE TIMERS AND VALVES