The delivery was super (next day). They came with no instructions and I didn't realize the split nuts were threaded. Once I figured that out it was easy. There was a little wiggle room so I slipped the heater out, cleaned the flanges, insetted the washers, assembled the new nuts and tightened took about an hour since I disassembled the the hot tube cowling and reassembled
Rating: [4 of 5 Stars!]