1" Female 1-1/4" Male Solid Brass Water Tank Connector Bulkhead Tank Fitting - Durable Plumbing AdapterP20211224396 Notice:The thread size on the title is not the fitting's OD,please check the size you need before ordering. Made of brass material in brass tone so it is anti rust.Embeded gasket provides strong seal without slipping. Using thread linking to make connection more firmly Not easy to leak with 2 Rubber Ring,double sided protection. Male thread brass quick connector.Female thread inside.Outside diameter of thread is about 1-21/32'(41.4mm).Notice:TPI is 11. It can be used in plastic water towers, water inlet and outlet, and self-made water storage barrels, which can be used for various pipes, faucets, hoses, fittings, etc. Specification: Easy to install. Durable construction. Solid brass construction for unsurpassed durability. Using thread linking to make connection more firmly Not easy to leak with 2 Rubber Rings,double sided protection. Embeded gasket provides strong seal without slipping. It can be used in water towers, water inlet and outlet, and self-made water storage barrels, which can be used for various pipes, faucets, hoses, fittings, etc.