Place the revolutionary Single-Use FloraCap? on your 6 in rockwool cubes and maximize your space in the vegetative cycle. Its vacuum-form design blocks light while allowing air, water and nutrients to your plants. The FloraCap? was designed with the vegetative state in mind, but has proven a worthy tool for the avid top feeder throughout the flowering stage as well. Easy to automate with the 2 built-in 1/4 in holes for receiving hose. Made from BPA and lead-free plastic, 100% recyclable.