1200CW style pump housings use repair kit part# PHRKIIC.
Units manufactured prior to June 1992 (1200W housing) use repair kit part# PHRKII.
The Pump assembly 1200CW (current production) is a direct replacement for the 1200W* older PHII pump housing. The 1200CW utilizes a replaceable seal cartridge assembly which if worn is easily replaced. The former 1200W* housing when worn at the seal bushing area required a whole housing replacement.
*Units manufactured prior to June 1992 utilize the 1200W housing (see lower picture).