Fluval FX Service Kit compatible for FX Canister Filters filters. It contains the following,

FX2:

• 1 x Magnetic Impeller Assembly (Item #A20208)
• 1 x Motor Seal Ring (Item #20211)
• 4 x Top Cover Click-Fit Rings (Item #A20212)
• Filter Lid O-Ring (Item #A20213)

FX4:

• 1 x Magnetic Impeller Assembly with Bushing, O-Ring and Bushing Tool (Item #A20208)
• 1 x Motor Seal Ring (Item #A20211)
• 4 x Top Cover Click-Fit O-Ring (Item #A20210)
• 1 x O-Ring Filter Lid (Item #A20212)

FX6:

• 1 x Magnetic Impeller Assembly with Bushing, O-Ring and Bushing Tool (Item #A20206)
• 1 x Motor Seal Ring (Item #A20207)
• 4 x Top Cover Click-Fit O-Ring (Item #A20210)
• 1 x O-Ring Filter Lid (Item #A20212)