17. Can the green (1/8th inch) hose be used on a pump currently using red (3/16th inch) hose?

1. The important dimension is the wall thickness of the tubing. Both tubes have the same 1/16" wall thickness, so both can be used in the same pump head.
   
   1/4" ID tube can also be used, as long as the wall thickness is 1/16"

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