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Fig 100. Black nut - Yellow subs
These low pressure unions are ideal for manifold and applications where CWP does not exceed 1000 PSI.
Fig 200. Blue Nut - Grey subs
These unions are best suited for medium pressure ranges involving air, water, oil & gas service for cold working pressure upto 2,000 PSI. (For dimensions see fig. 206). Upto 4” no O-ring is used on the male sub. Beyond 4” size, an O-Ring is used on the male sub for sealing.
Fig 206. Blue Nut - Grey subs
These unions have an additional ‘O’ ring on the spherical surface of the male sub providing a leak proof seal. All dimensions of fig:- 200 & Fig-206 are identical.