Yes, the "Y" type units on the LEMO N Series have a lever to assist with mating and unmating.
Yes, LEMO has several connector series that have optional Stainless Steel shells, PEEK inserts, and for wet environments the sealed versions have optional EPDM seals.
(Note: EDPM seals are standard on the N Series).
Yes. The LEMO N Series Connector was designed specifically for robotics use in telemanipulator applications.
In addition, LEMO has several models in LEMO B Series, S Series, K Series, and E Series connectors, which are also suitable.