Response to This Clamp Assembly 18" - 181011 is the correct clamp band for a NS-36 depending on how old the filter is, you had mentioned it was an older filter but did not give a date - see note - "Filters made before 4/1/92 contain a different clamp band assembly. Replacement clamp band components are no longer available for those units. Do NOT attempt to interchange components between the different clamp band designs."

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