Pentair WC19-64 Top V Clamp w/o Nut Replacement for Posi Flo Cartridge Filter Top V clamp replacement Fits with Sta-Rite Posi-Flo pool and spa cartridge filter model T-50TX, T-70TX, T-100TX, T-50TXR, T-70TXR,T-100TXR Nut not included