Economical, flexible and easy-to-use, the Add-It™ and Fertilizer Caddy ™ Automatic Proportional Fertilizer Injectors are ideal for residential, commercial and greenhouse use including feeding lawns, shrubs, trees, flowers, raised beds, vines and potted plants automatically, without a pump, spreaders or hoses. They are available with capacities from one pint to five gallons and are designed to feed your plants using any liquid fertilizer nutrients or premixed liquid of water-soluble granular fertilizer through your drip irrigation, micro sprinkler, misting or sprinklers system. Add-It™ and Fertilizer Caddy ™ Automatic Proportional Automatic Fertilizer Injectors are designed for use under the water pressure presented in any the irrigation system with up to 80 PSI.