Keep your swimming pool water pump running smoothly with this reliable mechanical shaft seal. Designed to fit a 1/2" (12.7mm) inner diameter shaft, this seal provides a dependable barrier against leaks and water ingress, helping to extend the life of your pump. The stationary ring is made from ceramic, while the rotary ring is crafted from carbon, together delivering consistent sealing performance under demanding conditions. The secondary seal is constructed from nitrile rubber (NBR), offering excellent resistance to water and general wear. The spring and all remaining hardware are made from 304 stainless steel, ensuring corrosion resistance and long lasting durability. This mechanical seal operates effectively within a temperature range of -4°F to +176°F( -20°C to +80°C, handles pressures up to 145 PSI, and supports shaft speeds up to 10 m/s. Ideal for residential and commercial swimming pool water pump applications, this seal is a practical replacement part to have on hand for routine maintenance or emergency repairs.