How to Read Reducing Fittings; threaded 90, threaded tee, elbow, 90, fittings

How to read Reducing Fittings

To help Penn Machine users in reading reducing fittings, 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

TEE

Reducing on outlet
(1x1x3/4) TEE

Reducing on
one run
(1x3/4x1) TEE

Reducing on
one run & outlet
(1x3/4x3/4) TEE

Reducing on both
Run (bullhead)
(3/4x3/4x1)

CROSS

Reducing on one outlet
(1x1x1x3/4) CROSS

Reducing on both outlets
(1x1x3/4x3/4) CROSS

Reducing on
one run & outlets
(1x3/4x1x3/4) CROSS

Reducing on one
run & both outlets
(1x3/4x3/4x3/4)

LATERAL

Reducing on branch
(1x1x3/4) LATERAL

Reducing on one run
(1x3/4x1) LATERAL

Reducing on one
run & branch
( 1x3/4x3/4) ELBOW

Reducing elbow
(1x3/4)

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TEE Reducing on outlet (1x1x3/4)	TEE Reducing on one run (1x3/4x1)	TEE Reducing on one run & outlet (1x3/4x3/4)	TEE Reducing on both Run (bullhead) (3/4x3/4x1)
CROSS Reducing on one outlet (1x1x1x3/4)	CROSS Reducing on both outlets (1x1x3/4x3/4)	CROSS Reducing on one run & outlets (1x3/4x1x3/4)	CROSS Reducing on one run & both outlets (1x3/4x3/4x3/4)
LATERAL Reducing on branch (1x1x3/4)	LATERAL Reducing on one run (1x3/4x1)	LATERAL Reducing on one run & branch ( 1x3/4x3/4)	ELBOW Reducing elbow (1x3/4)