11/16" / 7/8" / 15/16" Hex Wye Strainer Cleanout Plug Wrench, High Carbon Steel Heating Filter Wrench for Hydronic Boiler Y-Strainer Maintenance

This dedicated flat hex wrench is purpose-built for servicing brass wye strainers on residential hydronic heating and boiler systems. If you’ve ever rounded off a brass cleanout plug, scratched your expensive strainer body, or struggled to fit bulky adjustable wrenches and sockets in tight boiler-room spaces, this specialty tool solves that common HVAC headache.

Made from heavy-gauge high-carbon steel and finished with black phosphating for reliable rust resistance, this open-face hex wrench delivers firm, positive torque without slipping, bending or damaging soft brass caps. The slim low-profile design slides easily into cramped spots behind radiators, manifolds and tight pipe runs where standard crescent wrenches and deep sockets cannot reach. The ergonomic red plastic grip provides secure, non-slip handling, even in damp, wet plumbing service conditions.

We offer the three most popular SAE hex sizes found on Watts, Caleffi and Webstone residential Y-strainers. Each wrench covers a small tolerance window to fit minor manufacturing variations across different brass plug brands.

✅ 3 Popular SAE Hex Sizes Available — Choose 11/16”, 7/8”, or 15/16” to match standard cleanout plugs on US hydronic wye strainers. Each wrench has a tolerance range to fit minor brand variations.

✅ High-Carbon Steel with Anti-Rust Finish — Black phosphated steel jaw stands up to repeated torque, prevents slipping and protects soft brass caps from rounding and scratches.

✅ Slim Flat Profile for Tight Spaces — Low-profile open-face design accesses confined boiler and manifold areas where sockets and adjustable wrenches will not fit.

✅ Non-Slip Red Handle — Comfortable grip gives stable control when loosening or tightening strainer plugs in damp basement and boiler room environments.

✅ Must-Have Hydronic Heating Service Tool — Built for seasonal sediment flushing on Watts, Caleffi and Webstone Y-strainers. Great for HVAC pros and DIY boiler maintenance.