Well it sounds like Thor did the reverse of my coach.....used a 1.5 rubber coupling on the grey side and intended on hard gluing your 3 side.....but did not complete the job. I think if the outer ports on the Lasalle Bristal fitting were ABS glued to their respective tank outlet pipes you probably could undo the four nuts and bolts holding each blade valve, remove the valves and have the center complete fitting drop out. This would leave the two ABS port fittings held in place by the tank ABS outlet pipes essentially. Of course you would only do this with empty tanks and more than likely you would only do one valve at a time........unbolt old one; slide it out of position; slide new valve back into the slot and bolt back in place; then do the other valve.
So if Thor forgot to glue the 3 ABS pipe into the 3 port on the Lasalle Bristol fitting on your coach, I am wondering if the whole L/Bristol fitting must have moved toward the grey tank side for the spill to occur from the black tank (maybe Thor cut the 3 nipple too short? ). Were the 1.5 rubber coupling clamps tight when you had the leak?
IMO gluing the 3 side should fix the situation assuming no other damage or pipe spacing changes have occurred. You could do this by loosening the rubber coupling on the 1.5 side to allow movement and space on the 3 side for gluing and then re-position and reconnect the rubber coupling and re-clamp. Check the Lasalle Bristol fitting dump port for alignment if you have a floor port sewer hose connect through before any glue up.
If you are not under warranty still, you might want to have a tech do this repair if you do not feel comfortable with fast and unforgiving ABS glue situations. ABS cement does not allow much room for error and the valves would probably be best left screwed in place to ensure alignment and correct spacing of the final result.
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