It is impossible to get back to the connection to the toilet, the Toto Aquia skirt wraps around and hides the connections.
Is there an extension to connect the junction valve for the washlet to the water supply and goes to the toilet. If so, does the junction valve just "hang" only connected to two water supply hoses?

How does the Toto Aqua Toilet perform with a septic system? Are there any issues that I should be aware of?