Valves are the first step in main easter egg “Meat is Murder”. Once you open the door in Sewer, there are five valves before you reach EXO Suit. Next, Near Tac-19 (two on the walls). Two again on the ramp (this ramp is where you can activate the trap). Inside Trap, there’s two and one is near where alligator comes out. Two in between waterfall and power. Two again below steel Bridge (Whatever you want to call it). One near the entrance going to Decontamination Zone. Three inside Decontamination Area (Two can be found near the door and the other one is in the back corner near 3D Printer). Once you come out to that area, go to your left and look for a control box and its on the top of that. Next, we need to open Sewer Junction. There are two you can found near Fast reload (One is infront of that perk machine and the other one is on the left of the same perk machine where you can drop down for quick access to the other side). Five near Power (Two on the ceiling, Two on the water and one is in the corner going to Burgertown). Last two can be found near the gate going to Burgertown. Total of 30 valves that we found.