GLA PRO-6 Aquarium CO2 Regulator (6 Block Modular Manifold) MSRP: $550.00 Installation CGA-320 Pressure Reduction SINGLE STAGE CO2 Distribution SIX AQUARIUMSSIX BLOCK MANIFOLD(expandable) GLA PRO-6 Aquarium CO2 Regulator (Modular Manifold) Our GLA... Qty in Cart: 0 Quantity ( in cart): Decrease Quantity: Increase Quantity: Price: MSRP: $550.00 Subtotal: Add to Cart