Abstract: An end dam for use in a coater head which applies a coating material under pressure from a reservoir onto a web is shown to include an attachment arrangement for attaching the end dam to the coater head a first wall which prevents the lateral movement of the coating material, thereby defining one end of the reservoir, a second wall, spaced from the first wall and laterally away from the reservoir, such that a channel is formed therebetween so that coating material passing over the first wall experiences a drop in pressure sufficient to maintain the coating material within the channel.