EMT, from electrical not mechanics - Electro Metallic Tubing [conduit]
NOS as used here, New Old Stock [made back in the day, still on the shelf unused]
NOS as used by street racers, Nitrous Oxide System

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot