Replacement Pentair Manual Air Relief Assembly – BRASS. Pentair P/N – 273564Z. This is a direct replacement for the Pentair TR-100 Series sand filters manufactured by Val-Pak. Because this is made of brass, it will last virtually a lifetime – only items to replace is the pressure gauge and the air relief knob. Weighs almost 2 pounds. Includes the base o-ring. For use on the TR-100C / TR-140C / Triton C / Triton C-3 sand filters. Item # 3 as shown in the parts diagram. Filter lid must be removed to replace the air relief assembly – Does not include the internal nut that holds this to the lid. Manufactured by Val-Pak P/N = V20-230. All items are factory sealed unless otherwise noted. All manufacturers warranties are applicable and defects are the manufactures responsibilities. Everything in the description is true and correct as of this listing. Please contact our store if there are any issues or questions regarding any items listed for sale.