With its unique snout, the 4VP-3AT tee by Selkirk is intended to connect directly to a 3-inch VP appliance outlet via adjustable hose clamp. The tee section connects to standard VP pipe. The 4VP-3AT also has an extended inner snout and a removable outer snout to allow trimming for installations when reduced clearance is desired. Contact: (800) 992-VENT or www.selkirkcorp.com.