Nordyne 663706R Furnace Hard TubeThe Nordyne 663706R furnace hard tube is a durable replacement part designed for residential HVAC systems. This Nordyne hard tube features a J Trap design and is built to endure the high temperatures and demanding airflow of modern furnaces. Compatible with 040 08, L1RC, G6RC, G6RD, and G6RL models, it supports upflow, horizontal, and downflow installations, making it a versatile choice for many residential setups. Its rugged construction and J Trap

with plug-and-play compatibility

3 Milliliter/Second

reduce cycling

End connection: 1/8" female thread (air)

3-way zone valve body for precise flow control in heating and cooling systems

this unit delivers versatile installation for standing pilot applications

easier installation

and other chilled-water applications

Low maintenance with straightforward calibration and long-term durability

Compatible with PPC4000 and NXF4000 controllers

The actuator accepts a 2–10 VDC control signal and offers quick

it integrates smoothly with most Goodman units and similar HVAC configurations