This standard length extension hose is for use with a variety of Hoover uprights.  The machine end is 1 1/2" in diameter with two locking pins which hold it in the vacuum.  The other end is extra large to fit OVER (not into) wands and attachments.  For use with Hoover Windtunnel Supreme, Savvy, Empower, FoldAway and other uprights including: U5445900, U5262900, U5423900, U64019RM, U6423900, U6425900, U6425920, U6425950, U6429900, U6430900, U6431900, U6432900, U6433900, U6434900, U6435900, U6436900, U6437900, U6439900, U6441900, U6441940, U6445900, U6445920, U6446900, U6449900, U6450900, U6451900, U6451960, U6455900, U6455960, U6458900, U6459900, U6460900, U6470900, U6470910, U6471900, U6473900, U6474900, U6476900.  Also for use with other simlar models not mentioned here. 

NOTE: Bagless Windtunnel units require hose #43491051.