Dump valve replacement gone bad

[mielock]

I was mostly concerned about how to get a new dump valve in place with seals intact between two immovable objects until I tried to remove the faulty one, which I did not succeed. After removing the 4 bolts, the valve will spin, but the amount of force I applied to unseat it with no outward movement made me stop and ask for help. I've watched YouTube videos that show one or both sides of the valve to have flexibility in the plumbing, but for me, absolutely zero flex. The plumbing on either side of the valve is not moving anywhere. Any suggestions how to remove the valve and get the new one installed without seal issues?

[K_Charles]

this would be a good time to fix the leak.

[therink]

If it were me and I couldn't loosen the drain pipe enough to get flex to unseat the valve, I would likely cut the 3" drain pipe with a saw and reconnect using a 3" fernco connector.
The use of aluminum flashing between the valve seats to remove and reinstall is good advice.

[newman_fulltime]

use a ratchet strap to lightly pull at the elbow to give enough clearance

[BTPO1]

24fb freedom wrote:
Try looking further down the line to see if there is any brackets you can remove to give it some play.

X2, also it might help to have someone helping you with this project. I have found on some systems two people make it easier to install. JMO

[mielock]

All that gunk is Plasti-melt which was supposed to fix a hairline crack in that area that was leaking. What you're seeing is about 8 coats of it, which by the way, did not fix the leak. I used some epoxy over the Plasti-melt that ultimately fixed the leak.

[24fb_freedom]

Try looking further down the line to see if there is any brackets you can remove to give it some play.

[enblethen]

You will need to pry lightly on the fixed plumbing pipes.
To install a thin piece of sheet metal flashing material on each side of valve to slide it in. When in place slide sheet metal out. Coat metal with dish soap will make it easier to slide out.
What is all the gunk around inlet to the tank?