Trench drain grates have traditionally been inlay grates, meaning no locks. If no locks are required, it will be indicated in the Dura Trench part number as “GLNR”. For many applications this is still the best approach. For example, inside a processing plant or a food and beverage plant where the trench must be cleaned often it is best to not secure the grates. If the channel drain grates are secured to the frame or body it takes considerable time to loosen the bolts and re-secure after each cleaning. Also, many grates even in exterior applications are slow speed and have heavy trench grates. In these applications grate locks are not required.