This replacement duck bill can be used to rebuild the following:

• CSI Nitro/Nitro Pro air injector (20009X007)
• CSI Sidekick air injector 
• CSI Reactr/Hydroxr air intake check valve (65555X250)
• WaterSoft  Centuri air intake check valve (20944C250)
• WaterSoft Sidewindr air injector 

Includes rubber duck bill and black plastic insert.