4" Tri-Clamp Spools nutrients which is one of the

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4" Tri-Clamp Spools nutrients which is one of the4" Tri Clamp Tri Clover Spools Sizes Available: 4" x 2" Tri Clamp Spool 4" x 4" Tri Clamp Spool 4" x 8" Tri Clamp Spool 4" x 12" Tri Clamp Spool 4" x 18" Tri Clamp Spool 4" x 24" Tri Clamp Spool 4" x 36" Tri Clamp Spool 4" x 48" Tri Clamp Spool Specifications Tri Clamp Size 4" Material 304 Stainless Steel Standard 3A High Polish Spool OD 4" Spool ID 3. 834" Flange OD 4. 682" Bead Center 4. 344" OD = Outer Dimension ID = Inner DimensionDisclaimer to