It came with the unit, found it tucked in a drawer, I think. We did buy one before we realized one was provided and it cost around $3.
Deb & Gary
2007 Ford E150 cargo van, 2012 Rockwood Premier A126
Everybody needs beauty as well as bread, places to play in and pray in, where Nature may heal and cheer and give strength to body and soul alike._ John Muir