Fertilizer Injection Kit for GDK1000. Inject soluble fertilizer directley into the GDK1000 garden kit. Comes with all the fittings to connect to GDK1000. Simple installation allows soluble fertilzer to be mixed with irrigation water and delivered to the root zone of your crop. Must use at least 200' of drip tape for injector to operate properly. Kit includes the following: (1) 1/2" fertilizer injector, 5' suction tubing, (1) strainer for suction tubing and various connection fittings.