Overview Product Description O RING-NEW 25-31986 OEM REPLACEMENT PART FOR MERCURY & MARINER OUTBOARD MOTORS & EARLY MERCRUISER 1965-1968 Product Videos Custom Field Product Reviews Write a Review Write a Review × 31986 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *