Universal Fire Hydrant Nozzle Caps TRUMBULL HOSE & STEAMER NOZZLE CAPS are stocked with National Standard Threads (NST), and a 1-1/2″ pentagon nut, painted yellow. For caps with special threads and operating nuts, contact us for pricing and lead times. Features NST threads* and 1-1/2" pentagon nut** Includes gasket, Extra Gaskets available separately Chains with swivel and S-hook available separately Contact us for special orders, other colors, or quantity pricing * For special threads, provide thread drawing or sample cap. ** For nut sizes other than 1-1/2" pentagon, provide size and shape or sample cap.