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- For heater tubes with 1 5/8 and 1 7/8 inch outside diameter.
- Sold in a pair as nut and retainer ring to repair/replace cracked or broken pieces.
- TIP: Nut installs first, then retainer ring is split open and forced over tube flange to allow nut to pull against flange. recessed notch on ring faces nut.
- NOTE: Not a replacement for 'split-nuts'.
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