This adapter is designed to mount directly onto the pressure relief / non-return valve of a boiler using a 1/2” BSPP thread.

Its purpose is to unlock the valve and speed up boiler draining, making disassembly and maintenance much easier and cleaner.

The bottom of the adapter is sized to accept a standard garden hose, allowing you to safely route the water to a sink, drain, or outside area.

⚙ How It Works

The adapter features an internal pin that deactivates the safety valve, allowing water to flow freely out of the boiler through the connected hose.

You can use PTFE tape on the threads to prevent unwanted leaks during draining.

🛠 Printing Recommendations

Material: PETG Layer Height: 0.15 mm Infill: 100% Brim: YES Support: NO

🚰 Usage Instructions & Safety Notes

Let the water cool down before draining the boiler. The internal diameter of the garden hose must be 15 mm. To allow proper water flow, open a hot water tap or disconnect the hot water outlet. For a cleaner and safer workflow, it is recommended to install two small shut-off valves: One on the cold water inlet One on the hot water outlet This allows you to disconnect hoses with the valves closed, mount the adapter, and avoid water spills. This adapter makes boiler maintenance faster, safer, and much more controlled, no more messy draining or struggling with the relief valve.

Sponsor ❇

Thank you to PCBWay for reaching out and sponsoring this project:

If your printer isn’t capable of printing technical materials that can withstand high temperatures or if you simply want to build this project using premium materials and finishes, PCBWay can come to your rescue!

PCBWay supports me in the development of my projects and specializes in PCB, PCBA, CNC, and 3D Printing, and has (in my experience) the best support & the widest amount of options for manufacturing as compared to other services. I highly recommend it.

Their 3D printing services offer a very wide selection of processes including SLA, DLP, FDM, SLM, SLS, PJ, VC, and materials including metals and nylon. The ordering process is very quick, just upload the design file and select the parameters.

The same print is uploaded on PCBWay+ Community, you can go here and get the print with one click.

👉 If you're new there don't forget to use this link for 5$ discount https://pcbway.com/g/3BjHD9

Share Your Make and Remix!

I’d love to see how you build and customize this project. Your feedback is incredibly valuable and helps me improve my designs.

Follow for More

Don’t forget to follow 3D KIMBA for more projects, creative ideas, and helpful tools for makers!