gardena fertilizer dispenser for incorporating the universal liquid fertilizer gardena (8303). Grand opening. with level indication. vacuum valve for the winter. connection for supply and distribution with pipes. with the `quick & easy` connection. part of the gardena micro-drip-system, a water saving method to uniformly deliver a targeted amount of water directly to the plant through continuous drops. the ground remains soft and even water and evaporation or runoff of water is limited.