Marine Grade Electrical Wire Seal - Round Cable, 18 to 10 AWG, 3/8" NPT. Made of Nylon 6/6 flame resistant, self extinguishing Buna-N form seal. All seals exceed NMEA 4 x or 6 specs. Overlapping clamping spines allow for superior pull-out protection and resistance. Strain relief fittings are resistant to salt water and acid.. Features:. Round Cable. 18 to 10-Gauge/AWG. 3/8" NPT. 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.