The Pentair TR50 Air Relief Tube 150040 is a genuine replacement part designed to help your filter purge trapped air and maintain proper water flow. Installed inside compatible Pentair Triton sand filters, this tube directs air toward the manual air relief assembly so it can safely escape during operation. Made from durable, chemical-resistant materials, it stands up to constant water exposure and filter pressure. Replacing a cracked or clogged air relief tube restores proper filter operation and helps prevent air pockets from forming in the tank. What does the Pentair TR50 air relief tube do in a sand filter? The Pentair 150040 air relief tube channels trapped air from inside the filter tank to the air relief valve assembly. This allows air to escape during system startup or after maintenance, preventing pressure irregularities and improving filtration performance. Because it’s an OEM Pentair component designed for Triton sand filters, it installs easily and fits correctly without modification.