The Oregon 37-602 4-gallon heavy-duty backpack sprayer is perfect for all commercial applications that require intense daily use. The Oregon backpack sprayers have many features and benefits making it a superior option for your spraying needs. To start, the wide 4.5" diameter lid allows for easy fill while the diaphragm value included with the lid prevents leakage. Next, the internal piston pump reduces potential exposure to external chemical leaks making it a safer product while storing or spraying. Furthermore, the strong yet lightweight plastic along with the deluxe padded straps makes it more comfortable for the operator. Lastly, the 65" hose and 28" wand combined with the lightweight trigger valve with a locking trigger and integral filter creates an effective disbursement mechanism.