These economical KECK adapters, clamps, and clips will not scratch glass or corrode-ideal for glass and tubing assembly. All KECK products are color-coded for fast, easy size identification. Use quick disconnect adapters for safe, convenient tubing-to-tubing or tubing-to-glass connections. Use RAMP CLAMP tubing clamps for easy, one-handed tubing flow control. Select standard taper clips (in plastic or lacquer-coated steel) or ball-joint clips for secure glass-to glass connections. Unique wheel-in-groove clamp design permits one-handed flow control. Simply remove wheel to insert tubing, then roll wheel back into clamp to your desired flow rate. Made of pure PBT, these clamps are safe to 392°>F (200°>C). All four sizes accept tubing with a maximum wall thickness of 3/32" (2.4 mm). Roll wheel forward to restrict tubing and decrease flow. Roll wheel back to open tubing and increase flow.