Spa-Quip Compact CC50 (and some C50), CC75 (and some C75) filter parts. These filters from the 1990s are obsolete, parts discontinued, and will need to be replaced. Locking ring came in blue or black. Lid & locking rings are obsolete so a new filter will need to be plumbed. 

Note: There is no easy solution to replacing this style filter as all new spas typically use skimmer filters. The best solution is to replumb and fit an external filter, such as the Astral XC Filters here.

Spare Parts:

• Obsolete - Lock Ring: Q2030BK, Q2030BL, Q2030 
• Obsolete - Lid: Q2031O-ring: Q2032

Replacement Recommendations:

• C50/CC50 Replacement - Astralpool XC 50
• C75/CC75 Replacement - Astralpool XC 75