Exhaust Manifold Fitting Nylon | Indmar 605012 Indmar Nylon Exhaust Manifold Fitting | 605012 90 degree 3/4 in. NPT x 1 in. hose barb exhaust manifold water fitting. ndmar exhaust manifold fitting 3/4 in. NPT x 1 in. barb Nylon construction Sold individually Can withstand working temperature up to 250 degree F Original Indmar