Waterway Old Faithful Jet 210-7277SThe Waterway 210 7277S is a complete jet unit known as the "Old Faithful" with a 4 3 4 inch hole size. It is comprised of a stainless steel and gray elliptical face with a 5. 75 inch diameter, designed with a 2 inch slip water connection and a 1 2 inch slip air connection. This part is rated to handle a flow rate of 90 gallons per minute and is suitable for various spa and hot tub models requiring this specific jet configuration.