Weil McLain 560-742-880 Aluminum Tube

The Weil McLain 560-742-880 Aluminum Tube is a 20 inch length of AL3003 aluminum tubing with a 1/4 inch OD and a 0.032 inch wall. It is catalogued as Tube AL3003-0.25 OD x 0.032 x 20 in. Parts retailers commonly list it as a pilot line for the LGB, LGB-5 and MGB boilers, which makes it a short, ready-to-route length for that kind of run.

AL3003 is a commercial aluminum alloy that bends and cuts easily, which is why it is a common choice for small-diameter tubing. The 0.032 inch wall on a 1/4 inch OD tube is thin enough to form by hand with the right bender while still keeping its shape once it is routed. Because the tube is a plain length, the finished connection depends on the fittings and installation method called for in the boiler manual, so follow the manual for your model. Handle the tubing carefully, avoid kinking it while you bend it, and make sure the cut ends are clean and square before you make a connection.

Weil McLain also sells the same tubing in a 60 inch length as 560-742-905. The 560-742-880 is the better match when a replacement run is short, and the longer length is the one to choose if you need more material to route around other components. Match the 1/4 inch OD and 0.032 inch wall to the original tube, and check the boiler model before ordering, since the catalog entry gives the tube size and length but not a full fit list.

Key Benefits

• 20 Inch Length: A short length that suits small replacement runs without leftover material.
• AL3003 Aluminum: A workable aluminum alloy that forms easily for small-diameter tubing.
• Often Specified for LGB, LGB-5 and MGB Pilot Lines: Parts retailers commonly list 560-742-880 for the pilot line on these boilers.
• Manufacturer Part Number: 560-742-880 is the Weil McLain catalog number for the 20 inch tube.

Common Questions

• What size is the 560-742-880? AL3003 aluminum tube, 1/4 inch OD with a 0.032 inch wall and a 20 inch length.
• Is it a pilot tube for the LGB, LGB-5 and MGB? Retailers commonly list it for the pilot line on those boilers. The Weil McLain description reads only Tube AL3003, so confirm your model with our team before you buy.
• Is there a longer length? Yes. The same tubing is available as 560-742-905 in a 60 inch length.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.