Metro Plastech supplies Corrosion Resistant Tank Nipple. Metro Plastech offers plastic sanitary water taps, foot valves flexible connection hoses and accessories, etc. Corrosion Resistant Tank Nipple is water line accessory that is available in a wide range of colours and sizes. The Corrosion Resistant Tank Nipple is manufactured using superior grade plastic and is long lasting. The standard sizes available are 1/2 inch, 3/4 inch, 1 inch, 1 1/4 inch, 1 1/2 inch and 2 inch.