Smart Garden Gro-Zone Max Growhouse Reinforced Replacement Cover A tough, reinforced replacement cover for the Smart Garden Gro-Zone Max Growhouse. Zip up and clip back access. 170cm high, 120cm wide, 50cm deep. FREE POSTAGE £20.90 Quantity: at £20.90 each Add To Basket Replacement cover to fit Smart Garden GroZone Max Growhouse. 150gsm extra strength high density reinforced PE cover Strong and durable zipper Two snap fastener 6 x velcro fixing tabs Note - replacement cover only.