Part number 605-4370 is an On/Off Valve Plunger and Cap Assembly manufactured by Waterway Plastics.
It is used to control water flow to features like neck jets or waterfalls.
Because Waterway is a major OEM (Original Equipment Manufacturer), this valve part is used across many hot tub brands rather than being exclusive to any one brand.
Brands Using the 605-4370 Valve
Dynasty Spas: This part is frequently used in their models for water feature control.
Jacuzzi / Sundance Spas: Often listed as a compatible replacement for specific older configurations in these brands.
Hydro-Quip: Distributed and rebranded by Hydro-Quip for various spa control systems.
Dominion Spas: Specifically identified as an On/Off valve component for their spa lines.
Compatible Valve Model
The 605-4370 assembly fits several specific Waterway 1-inch single-port valve bodies, including:
600-4367
600-4361
600-4387
Identification Detail
Type: 1" On/Off Valve Internal Plunger & Cap.
Function: Provides 100% shut-off for specific water features.
Alternative Part Numbers: It can replace or be listed as 369898, 602-4620, and 602-4390
