Ace Race Parts 53018 2 x 1-1/2 Schedule 5 Concentric Reducer 321 StainlessAce Race Parts 53018 2" x 1 1 2" Schedule 5 Concentric Reducer 321 Stainless A Smooth, Free Flowing Way to Step Up or Down in Size! The Ace Race Parts brand of Schedule 5 45 Degree Weld Els are available in 321 Stainless! Ace Race Parts 321 Stainless Weld Els offer superior corrosion resistance in high temperature applications especially applications that will see extended periods of wide open throttle (eg: a track car) or will see repeated high heat