Oh man, I leapt on 'telescopic tubing' quick; but too small.

Some day will find replacement, cannibalize or conjure larger sizes adequate for coolant drain of horizontal mill. Guess I could build a pull expander swage, there is at least one commercial rotary swage shop in Paramount, CA.
There are DIY challenges aplenty, to slide without jamming or disconnecting, but just gravity operates them.
Common setup is a double swivel banjo/ elbow on the back of the table, the tubes (3 or 4 pieces) increase size toward the machine base, entering a second double banjo. Each is coupled perpendicular to manage X-Y-Z table movements.