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    Delta 4 - 3 x 3 x 2.5 in. Image
    Delta 4 - 3 x 3 x 2.5 in. Image
    Delta 4 - 3 x 3 x 2.5 in. Image
    Delta 4 - 3 x 3 x 2.5 in. Image

    Delta 4 - 3 x 3 x 2.5 in.

    Gro-Blocks with Hole - Stonewool - 8 Blocks Per Strip - Grodan RWDM4G

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    Delta 4 - 3 x 3 x 2.5 in.

    Gro-Blocks with Hole - Stonewool - 8 Blocks Per Strip - Grodan RWDM4G


    Grodan RWDM4G Delta 4 gro-blocks are the perfect size for you to place a 1.5-inch round starter plug, macro-plug, or mini-block. When seedling roots have grown one inch long from the bottom of your starter plug, simply transplant the plug into this 3 x 3 x 2.5-inch block. The Delta 4 block can then be placed on top of a grow slab to provide for a larger growing volume if desired. This is the most uniform block available on the market with its compressed stonewool fibers and improved grooved base to promote superior drainage. Gro-blocks are sold in strips of eight and labeled with instructions.

    Return Policy

    Grow Lighting & Hydroponics Return Policy

    Grow Lights, Hydroponic supplies, special orders, and non-stock items are sold as "ALL SALES FINAL, no returns accepted". All fixtures are considered Special Order and are non-returnable. Please allow an account manager to assist you in this kind of purchase in order to guarantee that you are receiving the correct product.

    Some grow lights and accessories have their respective factory warranties stated on our website. 1000Bulbs.com will assist its customers with these factory warranties in the following manner:

    If a product is declared defective and is under warranty; the customer is asked to contact customer service or their account manager and ask for a return merchandise authorization. (RMA) With the RMA, our customer may return the declared defective product at the customer's expense, for factory testing. When the factory tells 1000Bulbs.com that the product is defective and not a product that has been improperly installed, we can credit our customer for the product and we will also credit the original shipping costs of that original purchase. If a replacement is needed, it must be ordered and paid for as if it were a new order. (A credit for the defective may take from 2-4 weeks to be declared acceptable under warranty.) Any and all remedies concerning Hydroponics Supply purchases will follow guidelines as set forth here. Other products are not returnable under circumstances outside those described above.

    All of the products sold by 1000Bulbs.com are first quality products. All are factory tested and ready for customer application.

    WARNING: Non- Plug in Ballast wiring and installation procedures are very complicated and should be attempted by a licensed electrician only. Ballast installation poses serious risks of electric shock which can lead to injury or death.

    Shipping or Website Errors

    Should the customer receive product not expressly ordered either by our shipping error or incorrect website information, the product will be picked up by our shipper and replacements shipped at no additional charge.

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    MPN (Part No.):RWDM4G
    Safety Rating:Not Applicable
    Type:Grow Blocks/Stonewool
    Length:3 in.
    Height:2.5 in.
    Width:3 in.
    Package Quantity:8
    Weight:23.2 lbs.
    Case Quantity:48