Need A New Line From The Compressor Pump To Tank

Need a new line from the compressor pump to tank on your air compressor?

We are talking about the line that is attached to the compressor pump head, an example of which is shown in the image below, where the compressed air exits the pump. This line allows flow of air from the pump head to a fitting (usually) on the compressor tank.

Caution: on most air compressors this line is made of metal. Reason being, the air exiting the compressor pump is hot, and gets even hotter the longer the compressor runs. So hot that you can burn yourself if you touch it while the compressor is running and for some time after the compressor stops.

The red dot on the photo identifies a typical line from the compressor pump to the compressor tank.

Need A New Line From The Compressor Pump To Tank - www.fix-my-compressor.comNeed A New Line From The Compressor Pump To Tank


Compressors tend to vibrate a great deal and over time a fitting on this line may break, or the line itself may develop a stress crack and start to leak.

In other cases, the manufacturer of some low cost compressors may use a material in this line that is not capable of withstanding the vibration and the heat at all, and these lines fail with some frequency.

Regardless, if this line fails on your air compressor, you need a replacement.

Cannot Find An OEM Pump To Tank Air Line

What often happens, particularly with low cost compressors, is that there are few spare parts available.

Short of buying the same compressor again and using the old one for spare parts – a procedure that may actually cost less money than trying to buy individual parts for the compressor – where does one get a replacement line like this?

Take The Old Compressor Tank Line With You

These lines connect to different compressor fittings in different ways. In order to get a replacement, take the whole line, and any fittings that attach it, with you, and visit the nearest plumbing contractor wholesale supply.

They should be able to fit you out with a copper tube of the same diameter, and prepare the ends of the tube if flaring is necessary, and provide the various fittings that will allow you to connect this new tube to the compressor.

Do not use plastic. Do not use braided line. Neither can be expected to stand up to the rigors and the heat of the job, unless it clearly says on a label attached that they are suited for this use.

Bending The Copper Tube

Experience has taught us that it is almost impossible to bend this tube without kinking it if you do not have a tube bender. Since copper tube is the material of choice from pump head to tank, and also from tank fitting to the unloader valve, if you can stand the investment of $20 or so you should acquire a tube bender.

The contractor wholesaler where you acquire your tube may provide this service for you. That’s why you want to have the old line with you, in case there are unusual bends needed for it to fit properly on your compressor.


  1. Daryk scheirich says:

    Whats this doohicky going between my head and tank?

    • Well, we are not 100% sure, but given the “fins” we would suggest that this is a cooling device to start cooling the air before it enters the tank. We cannot tell but the nipple that is closest to us in the photo is capped, yes?

      • Daryk scheirich says:

        I think ive figured it out, most likely a cooler. The small steel line used to run to a second tank. The large vertical pipe is for the pressure switch to mount on, the small fitting in the back runs to the motor which I’m thinking is unloader…

        • my old sears compressor also has one of these “cooler manifold”. it has 4 ports. one for pop-off valve, tank prssesure gauge,air input to tank, and one for electric cut off regulator.

Speak Your Mind


Fix My Compressor Privacy Policy   |