Our Rain Harvesting Tanks come standard with a 16" Stainless Steel Strainer Basket installed on the top of the tank. The strainer basket is the entry point of the tank and keeps large debris like sticks and leaves from getting into the rainwater tank. There is also a stainless steel screened overflow assembly, outlet bulkhead fitting and a 1" bulkhead fitting for a water hose spigot. The stainless steel screened overflow assembly is designed for directing overflown water during large rain storms while keeping pests & mosquitoes out of the tank. Do not drink collected rainwater without proper filtration. Please contact your distributor for proper filtration methods.