Ancor - NMEA 2000 Blanking Cap - Male - 270112. Covers unused couplers. Protects unused tee connectors from dust and water. Comes in a 2-Pack.. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.