Refurbished fuel filter for the hot rod. It's from a Vietnam era Huey. I trawl the Aircraft parts section of eBay. There's a lot of "Spitfire" parts on there ;-) but occasionally there's some good stuff. I fitted a Moon fuel pressure gauge too.
It's a very fine stainless mesh. This filter is between the pump and the carb. There's another filter between the tank and the pump.