Use these on Drip Tape rows only:
FCH-06-LSL (Jain#12030058) Fits 5/8-inch Drip Tape
 A Low-Pressure Flush Valve with Drip Tape Connector.   0.6 GPM is required to close and reopens when pressure falls below 1 PSI (white plunger).
Use these on Poly Lines / Dripper line rows only:
FCH-L-FHT  Low Pressure Automatic Flush Cap. (These are CAPS ONLY)
FCH-L (Low):Â Â 0.6 GPM required to close, reopens when pressure falls below 1 PSI
FCH-H (High):Â 0.8 GPM required to close, reopens when pressure falls below 2 PSI