$0.17 ea.
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40 Pack for

White side - Hydrofarm HGCOV4 - 4 in. - Rockwool Block Covers
Additional Media

Rockwool Block Covers - 4 in.

For Use with 4 in. Gro-Blocks - Pack of 40 - Hydrofarm HGCOV4


The dual purpose, Hydrofarm HGCOV4 block covers are specifically used for 4-inch rockwool or stonewool gro-blocks. With the white side reflecting light back towards plants and the black side blocking light from the media, these block covers reduce algae, pest problems, and mildew, while enhancing growth proficiency. Pack contains 40 dual-sided block covers.


Stock Code:  GROW-HGCOV4
Part No.:  HGCOV4
Width:  4 in.
Weight:  0.2 lb.
Package Quantity:  40
Brand:  HydroFarm
Length:  4 in.
Height:  4 in.
Use With:  4 in. Gro-Blocks

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