Vibrant Performance Aluminum Joiner Coupler, 4" OD x 3" long Hose Joiner - 4 in OD - 3 in Long - Aluminum - Natural - Each Vibrant Performance's Aluminum Joiner Coupler allows you to easily connect hoses for a seamless and secure fit. Made from durable aluminum, this 4" OD x 3" L joiner is a natural choice for your plumbing needs. Get the performance and convenience you need with this high-quality, expertly crafted coupler.