4" Tri-Clamp Spools nutrients Gro-Blocks are similar to a

Gro-Blocks are similar to a plant container

When applying low rates

Each carbon filter features premium-grade Australian virgin charcoal and comes with 1+ refill

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4" Tri-Clamp Spools nutrients Gro-Blocks are similar to a4" 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