Hayward C1200 Star-Clear Plus Cartridge 120 sq. ft. With 1-1/2in. FIP In Ground Pool Filter

http://www.poolsupplyworld.com/hayward-C1200-Star-Clear-Plus-Cartridge-120-sq-ft-With-1-12in-FIP-In-Ground-Pool-Filter/C1200.htm?xzm2&ecmpid=aw_pla_search_C1200&adtype=paid&gclid=Cj0KCQiAwp_UBRD7ARIsAMie3XZ7_vbS0-JWAzjJCVyHc_ybTqdlBb_UAYiTqESwc2uzxb-3Kjovj04aApTfEALw_wcB

http://edc.poolsupplyworld.com/wpdf/starclearplus-manual.pdf

Hayward CX900G Locking Knob for Star-Clear Plus C751/C900/C1200

this one fits perfect 

http://www.poolsupplyworld.com/Hayward-CX900G-Locking-Knob-for-Star-Clear-Plus-C751C900C1200/CX900G.htm