DISCLAIMER: Propane is dangerous. I am not a certified anything. Be careful and use your head, dammit.
I have one of those turkey fryer setups with the timer that shuts the gas off every 20 minutes. That got tiresome, so I removed the timer.
It also has a safety interlock for the gas - you have to push a button to get the gas started, then hold it until a sensor heats up. This will shut the gas off if the flame goes out.
Then when I used my new 15 gallon pot, it was too wide and reflected too much heat back onto the control box, causing erratic behavior. The interlock would shut the gas off randomly for no good reason.
I decided to see if I could bypass all that by directly threading the regulator hose into the burner body. No such luck - the body is 1/8" NPT and the regulator hose is straight thread sealed with a copper washer. So I decided before buying a new burner, I'd see if I could defeat the interlock.
When I pulled the black box apart, I saw the fitting in the following picture.
The aluminum cap on the left side of the photo was straight up and the button was straight down. It's skewed in the picture because I tightened up the threads in the body of the burner and this is where it ended up.
There was a brass tube and fitting going into the top of the aluminum cap. I removed that, then removed the aluminum cap. Inside is a cartridge with a spring and rubber washer at the bottom. It's this rubber washer that seals the gas off. I popped the rubber washer off and the spring and metal washer behind it came with it.
Then I just put the cartridge back in and threaded the aluminum cap back on. There's no need to put the brass fitting back in the top of the aluminum cap because the cap seals on the cartridge inside.
Now the burner works like a normal burner. Turn on the regulator, you get gas at the burner. Yay!