Our low point valves turn 90 degrees only - cross ways to line is closed, aligned with line is open. Will not spin or pull. Must be different for each model or year. Probably whatever valve is available at lowest cost to manufacturer when unit was built.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.