Replacement cap fits on any I-20 series rotor (4", 6" or 12" pop-up) Includes the rubber cover portion of the top of the I-20 only. Rotor Not Included Hunter I-20 black replacement rubber cover. This replacement cap fits on any of the I-20 (4", 6" or 12" pop-up). Text on rubber cover says "I-20" and can be used to replace rubber covers for all the all versions of the I-20. Note: Includes the rubber cover portion of the top of the I-20 only.