Picture 10 of 15 from Album CharlesinGA's Bigfoot 25B21RB pics
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Water fill adapter. This is a long version of what Bigfoot requires to fill the tank. It allows water to flow to the tank even though the filler pipe goes uphill. It allows air to escape back thru the filler neck during the tank fill, which is blocked if you just shove a hose into it. Also the vent line is to prevent tank collapse when drawing water, it cannot vent enough air during filling, hence Bigfoots requirement for the fill adapter to allow air to escape thru the filler hose. Tube is made from 1/2 inside-3/4 outside clear plastic hose and a brass garden hose end with a 1/2 nipple, all found at big box stores such as Lowes, Home Depot or Menards.