Size 

Outside Dia 

Structure Diameter 

D0 

d 

L

 L1

B

D1

NPT(thd./in) 

1/2" × 1/4" 

21.34

11

29

23

30

31

18

1/2" × 3/8" 

21.34

12

29

23

30

31

18

3/4" × 1/2" 

26.67

13

33

27

30

33

14

1" × 3/8" 

33.4

12

38

30

38

39.5

18

1" × 1/2" 

33.4

12

38

30

38

39.5

14

1" × 3/4" 

33.4

18

38

30

38

38.5

14