This Sea & Sea 40mm Port Extension Ring 40mm (SS-56111) is in excellent condition, and includes the o-ring. Original owner - original packaging. • Dimensions (DIAxD): 135x56.5mm / 5.4x2.3inch • Weight: Approx. 345g / 12.1oz • Construction: Corrosion-resistant aluminum alloy (alumite coating) $230 - SHIPPING INCLUDED to anywhere in the lower 48.