Multi-port adaptors are useful for adding power, thermocouple, liquid nitrogen and other feedthroughs to existing (usually larger) flanges. These adaptors also can be devised to provide outboard support for things like rotary and / or linear motion feedthroughs so the motion can be delivered where it is actually needed. The "standard" support tube is 1.25" OS with pumpout holes, slots for wires and LN₂ lines and a removable adaptor with ball bearing (usually 0.375" ID).

               Many different configurations are available, including different size flanges, different numbers of flanges and radial spacing of the smaller flanges. The most common size uses 2.75" CFs on the top and bottom with 4 mini CFs around the body. Zero-length adaptor flanges can be used to mate the McMulti to other flanges.

2.75" CF top & bottom, 4 mini CF @ 90° spacing, and
4.5 adaptor flange, w/ 24.5: support tube
(as shown, above)