Plastic hose from pressure switch keeps blowing out

by Ernie
(North Chicago IL)

Plastic hose from compressor pressure switch

Plastic hose from compressor pressure switch

When my compressor reaches about 80-90 PSI the plastic hose from the pressure switch blows out.

If you look carefully at the photo you can see the plastic tube has ruptured.

Thank you for any help you can give me.


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Oct 05, 2016
Plastic hose from pressure switch keeps blowing out
by: Doug in

Where are you getting replacement hose/tube?

Most of it is rated to less than 100 PSI. You probably need more than that, 150 or so.

As has been mentioned, replacing it with copper tube is your best bet for a reliable fix.

Oct 05, 2016
Still no answers on why tube blowed out
by: Bill

I have no idea what compressor you have, what pressure switch, how the line is installed in the pressure switch, all would contribute to why you have not received any answers, Russell. That and the fact that you sent the same query three times and I only just received notification that you had posted this morning.

If you read the posts on this page it will explain how the air line to the unloader is normally connected.

If you have replaced yours with a new line, either the fitting has failed, or the new air line is under sized. Without more information it is impossible for me to be sure about the cause.

Oct 04, 2016
Still no answers on why it blowed
by: Russell

Replaced plastic tube blowed it about 80 psi what causes this? Please help need my air

May 31, 2015
Copper is better
by: Bill

You bet, Ernie. Copper is better than plastic anytime. It's not on many compressors now because it costs them more to included a component that will provide long, long life and has higher material cost.

If your PRV isn't blowing off (you do test it I hope - the PRV page for details), meaning the air compressor is over-pressurizing, then I don't see it being an issue other than the line is brittle where it enters the fittings, and the fitting isn't holding it securely any more.


May 31, 2015
Plastic vs Copper Lines
by: Ernie

Thanks Bill!!

Can I change that tubing to copper from plastic? I have a bunch of old compressors that don't have any plastic only copper lines?

Is the fact that the plastic line is blowing out, a sign of a more serious issue orjust that the plastic line is old or not strong enough?

Thanks again!!!

May 30, 2015
Plastic hose from compressor blows off
by: Bill

Well Ernie, I looked as close as I could, and didn't see where it was ruptured.

This air line is normally connected between the tank check valve and the unloader valve.

It looks like it might be a polyethylene or polyurethane line, but I cannot be sure from the photo.

If it's polyethylene, over time, elasticizers in the plastic have dried out and the tube becomes less elastic. The continual expansion as air moves through it, and the contraction as air is exhausted, essentially wears out the tube.

If it's polyurethane, the same thing happens, over a longer period.

Thing is, heat is not good for plastic tubes and, it is possible, that this tube has been baked a bit due to heat from the pump.

In any case, it looks like it's inserted into the tank check valve with a quick fitting. Push the tube into the fitting, depress the black collet around it and then pull the tube. That should release it.

Take the tube to a good hardware store or, better yet, an industrial supplier (google suppliers of air valves or air cylinders in your area to find them) and you should be able to pick up a length of tube of the same dimension to replace this one.


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