Navien Flue Pipe Clamp for NPE Water Heaters (GXX002203) A flue run left unsupported over any distance is prone to sag over time, and that's exactly what the Navien Stand Off Pipe Clamp is designed to prevent on NPE series water heater installations. Fitted at intervals along the run, it holds the 60/100mm flue pipe firmly against a wall or fixed structure, keeping it properly aligned rather than relying on the flue joints alone to carry its weight. Beyond simply tidying up the installation, correct flue support matters for safety: a pipe that's allowed to sag or shift can loosen joints over time, risking exhaust gas leaks rather than a clean, sealed run to the terminal. This clamp is built specifically for NPE compatibility, so it fits without adaptation, and is rated to handle sustained exposure to flue heat and vibration. Key Features &am