Airstream fresh water tank drain valve replacement

I built the replacement valve, then had a Mobile RV Technician come install it. He said that he HATES working on Airstreams. Airstream builds them like they will never have to be fixed. It took him 1&1/2 hours just to replace that drain valve. He said that any other brand, it would have been a 20 minute job. TOPS. He had to go inside the trailer and take a panel off so he could reach the back of the drain to loosen the hose clamp, then again to tighten the hose clamp.