NIOSH-Approved N95/N99 Masks for about $1 Get them now!
These horseshoe-shaped clamps are used to connect CG-138 flat O-ring flanges. The design allows the clamp to be installed or removed easily by twisting three adjustable tension locking screws. Clamps are made of cast aluminum with chemically-resistant green epoxy coating. Available in 32 mm, 57 mm, 80 mm, 4.5", and 5.5" flange sizes.
The 57 mm size is used with the AF-0200 vacuum trap.