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- Manifolds 4 Port QCA Spa Water Manifold 1/2 In Slip
4 Port QCA Spa Water Manifold 1/2" Slip. This 4 port manifold has 2" slip connector on once side and 2" spig connector on the other.
The 4 ports are 1/2" slip ports.
21110-040-000 - Old part number 53016400.
This is the current 4-port manifold used in QCA Spas plumbing.