The most important properties of a rain barrel fitting are durability, corrosion resistance, watertightness and compatibility with fittings and connections. We have designed our barrel fitting to meet exactly these requirements.GIFT FOR YOU: We include two rubber seals that fit snugly over the external thread, this means our tank grommet can be used in any weather, temperature and water pressure and can be connected to any outlet faucet with a 3/4 inch thread.BEST QUALITY: Our solid fitting for rain barrel with 1/2" (18.64 mm) female to 3/4" (26.44 mm) male thread made of high quality brass provides protection against rust, high temperatures and water pressure waterRecommended drilling: approx. 27 mm, flange: 40 mm, tank wall thickness: 1-16 mm