Gordon Brush's line of American made Flow Thru, slip-on, applicator brushes are similar in concept to Flow Thru luer lock brushes except that the former can fit on a type of tube/pipe that is slightly smaller than its 0.45" inner diameter, whereas the latter fits on a 16", 18", or 22" gauge needle.
The Flow Thru, slip-on, applicator brushes are available in 3 fill material choices: Hog bristle; nylon; and static dissipative nylon, set in an 1-1/2" length acetal handle, with a 9/32" width, and ½" trim length.