Pressure Compensating or "PC" means that a dripper will "Compensate" for pressure changes caused by elevation changes or pressure loss due to distance. At a rated pressure of say 25 PSI a PC dripper will give 2 GPH. If the pressure increases or decreases the PC dripper will give very close to that 2 GPH across a specified pressure range.
These are the "Best" type of drippers and work well in longer runs of tubing or where the elevation changes so each dripper will give a close range of flow.
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