Suit for Lowara pumpsSH-SVStep-balanced, O-Ring mounted,robust single spring seal with positive drive from three drive studs on the coil base,to suit larger models of SV- and e-SV- series pumpsShaft Size:22mm,26mmSH-T13Suit for Lowara pumpsShaft size:12mm,14mm,16mm,22mm,28mm,33mmFor more infromation about Lowara pump seals,Pls me.