2 middle of network 4 way switch. Here are another couple of variations of 3 and 4 way switch circuits.

Lm 9497 Wiring A 4 Way Dimmer Switch Diagram
How do you wire a 4 way dimmer switch. How can i wire a 3way dimmer switch to one of the switch locations. To wire a 4 way switch start by turning off the circuit breaker for the room youre working in. If you only need two switches leave out both the 4 way switches. Wiring a 4 way switch with light at the end. 1 line end 3 way switch. In a 4 way switch network there are 3 switches.
The dimmer switch now acts like a master switch. Remove all wires from the 4 way switch and cap both red wires with wire nuts. Next connect the white wire coming into the box to the white wire on the fixture. Youll notice that this switch has 2 red wires and 2 black wires connected to it if your 4 way switch has 2 white wires and 2 red wires connected to it your configuration is not compatible with the idevices dimmer switch. You can also add as many 4 way switches as you like in place of any one shown in the circuits that follow. Lets get our lingo straight.
The electrical source is at the first 3 way switch and the hot wire connects to the common there. Remove 34 inch of casing from the end of the house wires and the dimmer switch wires if needed. Free quick start guide here. Identify which of the 3 switches is at the line end. Then connect the black wire coming from the fixture to the black wire going to the first 3 way switch. If you want to install a dimmer id buy a lutron 3 way dimmer at a compatible wattage for the load.
I have a four way switch set up like your diagram shows and it works great. Do you recommend using push in type wire connectors. All the 4 way switches are optional. Also when using a dimmer in a 4 way switch circuit can you place the dimmer in any of the switch positions. Connect the ground wire from your dimmer to a green or bare copper wire in the wall box. I want to add a dimmer switch to one of the switch locations.
I replaced one of the three way switches with a 3 way dimmer switch. After that connect the black wire from the fixture to a red. The push in connections are ok except for 20 amp circuits or high load devices that will be used especially with outlets. If the house wires are bent use a wire stripper to cut off the twisted ends. 3 load end 3 way switch. In this basic 4 way light circuit 3 wire cable runs between all the switches and 2 wire cable runs from the last switch to the light.
Heres how to connect a three way dimmer switch. Here is an example of a light in the middle of the run.