requires a minimum of manipulation on the part of the operator this also facilitates easier overall removal of the drain insert 100 requiring less time and effort to perform this normally difficult operation placement of the interior wrench 1 is further facilitated in that the expansion of the two shell halves 2 a 2 b takes place with a rotation of the hexagonal core 3 in the same direction in which rotation of the interior wrench 1 will be used to unscrew drain insert 100 as a result the same rotational movement that forces the interior wrench 1 to grip the interior of drain insert 100 is also the same rotation that begins removal of the drain insert 100 this operation can often be carried out using one hand because perpendicular foot 41 holds the device in position while the necessary rotation takes place likewise the extension of the perpendicular foot 41 into the pipe 202 leading to the l shaped section 201 becomes very important when pipes break as they often do under the stresses of removing the drain insert 100 external torques on the drain insert 100 tend to cause failure at the weakest points in the connective system this is usually the lead pipe 202 shown as being broken and separated in fig6 which is.