I just replaced my leaky autostop fill valve with a reqular valve and put what's called a "90 percent" valve in the smaller hole. I got them at Metro RV in Santa Ana, CA. I had to shop for them a little as Suburban Propane in my area wouldn't sell me the valve due to a "liability issue" They were more than happy to sell me a new tank for $200.
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Leo Lipert
San Juan Capistrano, CA
'84 Wolfsburg Westy with leaky heads
'00 Golf