Pentair 30767-0003 T-Bolt Replacement for Pentair StaRite Swimquip DES Vertical Pool and Spa DE Filter T-bolt replacement Fits Sta-Rite Swim quip DES Vertical pool and spa DE filter model DES 25-01B, DES 36-01B, DES 51-01B, DES60-01B Measures 5/16-18-inch by 3-1/8-inch