Sundance Spas PCB Circuit Board (6600-730) grasslin Internal eyeball fittings like this

Internal eyeball fittings like this are useful because they help direct the discharge flow at the jet point while also contributing to the visible finish of the assembly

Helps preserve dependable SVRS performance over time

In the right retrofit application

For higher-value tubs

0 THP applications across all date codes where the original impeller has cracked

Sundance Spas PCB Circuit Board (6600-730) grasslin Internal eyeball fittings like thisThe Sundance Spas PCB circuit board is designed for compatible spa control applications where the main board needs to be replaced to restore system operation. A circuit board is useful because it acts as the control hub for multiple spa functions, helping coordinate heating, sensing, and equipment response. This replacement is especially useful when the original board has suffered component failure, visible damage, intermittent behavior, or no longer