Injector/ Drain Module For the Fleck 9000 and 9100 ( includes new injectors, new o-rings ( 13303, ( 2 ) 13301, 13302 drain = 9000 and 41500 drain = 9100 ), and .25 gpm BLFC and DLFC based on tank diameter ).If you need 0.50 GPM BLFC or 1.0 GPM BLFC button,