DIY Fix your hissing Toilets Anti-siphon Fill Valve

This is a single take video courtesy of my 7 year old cameraman. This instruction is how I solved a hissing toilet. I had installed a Korky QuietFILL system and it developed a sound of running water (hiss). I figured out that the fill valve in the cap had warped and needed replacement. The part cost about $3-4 at my big orange hardware store.