| CPC F16L 3/223 (2013.01) [F16L 3/2235 (2013.01)] | 26 Claims |

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1. An apparatus, comprising:
a main body having dimensions, the dimensions of the main body comprising a main body length along a first axis, a main body width along a second axis perpendicular to the first axis, and a main body height along a third axis perpendicular to the first axis and to the second axis;
the first axis and the second axis defining a first plane, the first axis and the third axis defining a second plane, and the second axis and the third axis defining a third plane;
the first axis, the second axis, and the third axis intersecting at a common reference point of the main body and defining axes of the main body;
the main body further having pairs of sides including a first pair of the sides, a second pair of the sides, and a third pair of the sides, the first pair of the sides comprising a main body front side before the second plane and a main body rear side behind the second plane, the second pair of the sides comprising a main body top side above the first plane and a main body bottom side below the first plane, and the third pair of the sides comprising a main body left side and a main body right side;
the first pair of the sides, the second pair of the sides, and the third pair of the sides defining the sides of the main body;
the main body further comprising a first end channel communicating along a first end channel direction between the first pair of the sides or between the second pair of the sides;
the first end channel having a first end channel passage that communicates from an interior of the first end channel to outside of the main body at the main body left side;
the first end channel passage having a first cutaway that widens the first end channel passage at the main body left side;
a second end channel having a second end channel passage that communicates between the second end channel and the main body right side; and
the second end channel passage having a second cutaway that widens the second end channel passage at the main body right side.
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