Flow Switch, Marquis, 1994-1999 73 This 4" Twilight tile is

This 4" Twilight tile is used on some 1995-1997 spa models

This would indicate a "low water flow" condition

It's held into place by two tabs the will release the jet face when the tabs are gently pried up using a screwdriver

('90 and Older Models)

Hot Tub Chlorine Granules

Flow Switch, Marquis, 1994-1999 73 This 4" Twilight tile isThis should be used in every spa with a dedicated circulation pump. Used in the following spas: 1994 BC42 Crossing MTS II ME42 Euphoria MTS II DR42 Reward MTS II JS42 Secret MTS II KV42 Voyage MTS II JM41 Mirage MTS I SR41 Retreat MTS I ES40 Spirit MTS I 1996 ME42 Euphoria MTS LQ42 Quest MTS SR42 Retreat MTS DR42 Reward MTS II DP43 Departure RS JM43 Mirage RS KV43 Voyage RS DT23 Destiny RO51 RO40 Oasis CS ES51 ES40 Spirit CS 1998 DR44 Reward MTS ME44