A tubeater is a pattern that consumes the output of a tubstretcher. The smallest known tubeater was found by Nicolay Beluchenko (September 2005), and is shown below in conjunction with the smallest known tubstretcher.
x = 29, y = 23, rule = B3/S23
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ THEME 6 GRID GRIDMAJOR 0 THUMBLAUNCH THUMBSIZE 2 GPS 4 ]]