The Ames 2000SE is a double check valve assembly (DCA). It was available in 2 1/2″, 6″ and 8″ sizes. It was produced from 1990-2006. The body was made of stainless steel. The “SE” models utilize the same check modules as the “SS” series but are one size smaller than the pipe size. Example: 8″ 2000SE uses 6″ 2000SS parts.