Reviled ,
I never had much luck with an autosyphon I think hey are a poor gimmick IMO , I mainly used for transferring from secondary fermentation into the kegs which I dont have to do now, I filter my beer into the kegs directly from the fermenter ,saves double handling etc.
However if you have to use a syphon from your kettle use a 'Jiggler syphon 'you can get them with a brass tip from AutOne shops .
The ball valve is far more effective than the bicycle pump type piston in the Auto syphon .
I dont know if you may requiret o replace the PVC with the silicone hose due to the high temperature you are syphoning at .
Pumpy