[Fig. 126] is a cross tee. This is frequently spelled with a capital T.
[Fig. 127] is a plug—used to stop apertures in plates or pipes.
[Fig. 128], page 254, illustrates a lock nut.
[Fig. 129] shows a T, as illustrating the difference between a T and a cross T, [Fig. 126].
[Fig. 130] is a coupling.
[Fig. 131], page 255, represents a reducing coupling.
[Fig. 132] is an illustration of a pipe union.
[Fig. 133] is a plain elbow (see also [Fig. 123].)