A unitary pressurizing tank cap used for direct substitution of existing manual pump spray closures. The tank cap connects to a standard garden hose and uses household water pressure to pressurize a tank's contents. The cap includes a flexible bladder for insertion into the tank. The cap further includes...http://www.google.com/patents/US5398852?utm_source=gb-gplus-sharePatent US5398852 - Tank pressurization cap
