A variety of types most commonly required for piping systems are illustrated on this page. In these illustrations, each opening of the fitting is identified with a letter which indicates the sequence to be followed in reading the size of the fitting.

In designating the outlets of reducing fittings, the openings should be read in the order indicated by the sequence of the letters "A", "B", "C", and "D". The following information is based on ASME B16.11 and MSS SP-106.

TeeReducing on outlet (1 x 1 x 3/4) |
TeeReducing on one run (1 x 3/4 x 1) |
TeeReducing on one run and outlet (1 x 3/4 x 3/4) |
TeeReducing on both run (bullhead) (3/4 x 3/4 x 1) |

CrossReducing on one outlet (1 x 1 x 1 x 3/4) |
CrossReducing on both outlets (1 x 1 x 3/4 x 3/4) |
CrossReducing on one run and outlets (1 x 3/4 x 1 x 3/4) |
CrossReducing on one run and both outlets (1 x 3/4 x 3/4 x 3/4) |

LateralReducing on branch (1 x 1 x 3/4) |
LateralReducing on one run (1 x 3/4 x 1) |
LateralReducing on one run and branch (1 x 3/4 x 3/4) |
ElbowReducing elbow (1 x 3/4) |