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The cap top forms the seal on the print head and connects to the pump
This seal controls the correct amount of ink from the cartridges into the print heads
This seal also protects the print heads when not in use from drying out due to air exposure
Test prints may have inconsistent nozzle patterns, or foam inside the cap top may appear swollen
Fits: LEC-300A LEC-540 LEF-12 LEF-12i LEF-20 LEF-200 LEF2-300 LEF-300 LEJ-640 SP-300i SP-540i VP-300i VP-540i XC-540 XC-540MT XJ-540 XJ-640 XJ-740 printers