Plastic Fittings & Teflon Tape?

[HappyPlace]

I am in the process of making and installing a hot water bypass system using plastic valves. The valves are threaded to accept the threaded 1/2” hose barb fittings for the water lines. Should I use Teflon tape on the threaded connections? Most of my internet searches indicate this is not necessary, but I always like to ask the experienced first!

Any input is appreciated,

Al Sr.

 

[SlackwaterJack]

It's only necessary on the threaded connections, the barbed connections get double clamped.

Why bypass the hot water?

 

[HappyPlace]

I wasn’t sure if the plastic threaded connectors get the Teflon tape as does the metal fittings.

Bypassing the hot water heater for winterizing.

Al Sr