Production of the 2 1/2"-10" 805Y series ended in 1988. The 2 1/2"-10" 805Y is a painted epoxy coated cast iron check valve body. The internal check hardware on the 2 1/2"-3" was made of bronze while the 4"-10" was epoxy coated iron. The check seats are replaceable on the 2 1/2"-10" 805Y. A seat removal tool was needed to replace the seats. The 2 1/2"-3" have springs that are not contained. The 4"-10" size has contained springs. Some versions of the 4"-10" had to release the spring tension in order to change the rubber check discs. A spring removal tool is necessary to release spring tension. The first few years the 805Y was produced with some internal parts constructed out of aluminum causing premature decomposition. They were later redesigned to correct the problem. The Febco 805YD series was introduced approximately 1988. It is produced in the 2 1/2"-10" sizes. In the Febco 805YD the body material was changed to ductile iron. In 1991 a fused epoxy coating was added to replace the painted epoxy coating which was used up until that time. The check seats are replaceable. The seat design was changed so that no special tool was required to replace the seat. The 2 1/2"-3" have springs that are contained. The 4"-10" have contained springs.