The Nitrous Express 18-inch 4AN stainless braided SHO hose is supplied with a black 3AN fitting on one end. NX describes these hoses as stainless braided with a Teflon lining and anodized fittings. This hose suits 4AN plumbing runs where an 18-inch SHO hose with a single black 3AN end is required and follows the construction details noted in the product description.
Nitrous Express 4AN 18in Stainless Braided SHO Hose (w/Black 3AN Ends - One End)