A hose coupler optimally configured for use with a liquid manure drag hose has a pair of hose coupler ends that are joined using a hose coupler having minimal protrusions and diameter. Each of the hose coupler ends is provided with a plurality of ribs and grooves. These ribs and grooves are arranged to mate with corresponding grooves and ribs formed in a collar. For each hose coupler end, a pair of collars are preferably used to secure a hose thereto. The ribs and grooves are preferably configured to secure the hose and distribute tension applied to the hose throughout the coupler end, while ensuring that the hose wall integrity is maintained. The resulting coupler is compatible with heavier drag hose, will not interfere with or harm the hose during winding and unreeling, and will produce less drag and be less likely to produce interference with obstacles in the field.