Upgrade your cooling system to AN fittings with a clean, direct setup. AutoPlumb Water Neck Adapters let you run -16AN or -20AN hose on radiators, water pumps, thermostat housings and other cooling system connections without welding or traditional hose clamps. No splices or reducers. Removable and reusable. Leak-proof and warranted against mechanical failure. Build your AN cooling system at AutoPlumb.com #ANFittings #CoolingSystem #RadiatorHose #LSSwap #HotRod