| Model | OD | ID | API connection thraead | |
| Upper kelly valve | XS197A | 197 mm (7-3/4″) |
76.2 mm (3″) |
6-5/8″ REG LH |
| XS200-1 | 200 mm (7-7/8″) |
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| XS203-1 | 203 mm (8″) |
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| Lower kelly valve | XS111-1 | 111 mm (4-3/8″) |
40 mm (1-37/64″) |
NC31 |
| XS121-1 | 121 mm (4-3/4″) |
44.5 mm (1-3/4″) |
NC38 | |
| XS135-1 | 135 mm (5-5/16″) |
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| XS168A | 168 mm (6-5/8″) |
71.4 mm (2-13/16″) |
NC50 | |
| XS178-3 | 178 mm (7″) |
5-1/2″ FH | ||
| XS184A-1 | 184 mm (7-1/4″) |
Kelly Cock Valve
Model: XS197A, XS200-1, XS203-1, XS111-1, XS121-1, XS135-1, XS168A, XS178-3, XS184A-1
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