Delta RP54977 Lahara 1.5 Gpm Aerator, Chrome This is an O.E.M. Authorized part or this is an authorized aftermarket product Fits with various Delta models Oem part RP54977 Just like ocean waves, the one-piece curves and sleek design of Lahara(R) make a lasting impression. Water Efficient Product meeting CALGreen standards Chrome.1.5 gpm aerator assy. 13/16"-27 male. Models: 1353, 3353, 4453, 11926 (DST models), Wrench RP52217