Response to Mark, If you look at the parts diagram for the C1750 the kit would include two of key #3, which are the teflon seals for the knob. It will also include the o-ring for the air relief valve (Key #15), the main o-ring (Key #7) as well as the o-ring that goes on the knob (Key #1). I would also make sure you have the E-ring that holds the knob in place as well E-ring (cx900j).

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