L1800 R1390 Cap spring. The Epson R1390 cap spring is essential for your Epson L1800 R1390 capping station functionality. If this spring is missing from your capping station , then your printhead will not create a good seal with the pump cap assembly and will eventually show signs of missing nozzles and bad print quality. Have you lost your Epson L1800 R1390 cap spring? Order one today for quick shipping.