Prevents corrosion, assures sanitary waterways, prevents lime and scale build-ups, adds years of service life to any water system. Extends the life of dishwashers, sinks, bathtubs, stationary tubs, toilets, water purification systems, and water heaters. Features electroplated steel casing with an inert, noncorrosion thermoplastic lining. 3/4" Male pipe thread x 3" long. 2 per card.