Description Rubber Cap / seal for Mueller Matic Fill and Drain Valve on Tank Mounted Washers. #18 in detail image Has a 3/8 inch hole in center also fits Internal Measuring Stick on Mueller Oval Milk Coolers and Bulk Tanks Outside Diameter - 2.5 inches Inside Diameter - 2 Inches Hole Diameter - .375 inches Related: Part No. M-21774 and M-8822394 are the same item #8 in drawing - 3/8 I.D. hose - part numbers M-30581 1010-825 Fits Fill & Drain valves; M-8822880 2.6 GPM M-8822881 3.0 GPM M-8823742 4.0 GPM OEM parts Made in USA by Paul Mueller Company 03/2023
