Plumbing pipe threads are squared and conduit pipe threads are tapered.
The threads
Joint compound AKA dope is used as a lubricant and to seal minor imperfections of the threads
Since water can leak through the smallest cracks and holes, applying a clockwise layer or two of teflon tape to the threads of a plumbing connection can help prevent water leakage.
Wrap tape in direction fitting will screw on. Keep tape back 2 threads when starting to wrap. Wrap tape 2-3 times around threads, keeping tape snug on threads as you wrap. Pull and tear tape when finished wrapping.
In plumbing we use BOTH right and left handed threads depeng on the useage Toilet handles for example are left handed threads threaded rod used for clevis hangers and riser clamps are right handed threads
Right hand threads. Right to tighen left to loosen.
Plumbing pipe threads are squared and conduit pipe threads are tapered.
they are right hand threads
Those are right-hand threads.
Right Hand
It is right hand tread.
Standard right hand thread.
On all Harleys the transmission mainshaft has lefthand threads. The motor's sprocket shaft has righthand threads.
Land Rover 32mm threaded fans are Left Hand threads, the 36mm threaded fans (which I think you have) are normal/ right hand threads.
propane tanks have left-hand threads.
Right handed.