Air release 5th wheel

I have 2 blocks on the frame beside the transmission? The front one is much smaller and when I push the button to release my 5th wheel it leaks? I looked at it and thought it was just a fitting but it appears to be the block leaking? Does anyone know the price or part number of this block? Is it repairable? Or just replace it.....

 

Mine works great at 11 years old like I said the only problem is a slite air leak at the solenoid pack but it still works. I just know that it's going to get to the point that it won't work

 

You have been missing out. Look at the pix the top piston is cab controlled and releases the jaws to unlock the trailer

 

On a 2019 it should work perfectly! You can only use it when the truck is running and tractor brakes are set. Do you just flip the switch or do you push it in with your finger? I need to push the switch past on and hold it with my finger until it releases then when I release the tractor brakes the pull handle on the 5th wheel falls and wolla your released