For multiple appliances try our double tee. Order the body size to fit the required liner. The lower tee snout is the same diameter as the body, while the upper tee snout has a 4" diameter. Double tees accept flex liner or rigid pipe available upon request. There is a 4" space between the upper and lower snout. Both snouts are 10' long. An example for the use of a double tee snout would be: The lower tee connected to a furnace or boiler while the upper tee would be connected to a hot water heater.