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But, I cant find it. Cant find it on eBay, MB on and on and on. Locally they do not sell the split compression rings. I understand it is a unit (see the one with the white pastic in it). This goes into the suspensison solenoid and hold the pnumatic lines in place.
I can not find them (with out the whole solenoid). I find couplers (abourt $80 for MB) but not these on their own. Note: there are two sizes in this image - the solenoid takes one big, two smaller (This is for E for so so many generations).
When I repaired my hose, I found couplers - the entire thing as you say - for rather short money . Not sure it's worth trying to find the individual compression ring?
Thin k it was like $15 for a full coupler (so two compression rings).
I should have been more clear. The one I find is the inline coupler - $80 from MB vendors all over. I assume I could take the two off of the ends and use them in my solnoid - that does not get me the larger one of the three. I did order the second image (via amazon, obvioiusly)...that also does not get me the larger one of the two sizes. Not at all trying to save money - trying to find the parts (and I do not trust the cheap ones I ordered from Amazon). All of the local auto shops do not have compression rings with that slice in them - only fully round and angled on both sides.
Last edited by OldManAndHisCar; Feb 24, 2026 at 11:32 AM.
You can absolutely recycle the current one if you have to. Just (very) carefully expand it a sliver and then remove it.
I'd much rather have a new one but just in case you can't buy it.
purchased some Arnott fittings from them for the BMW bags one year. if I remember right, they were a little higher quality.
McMasterCarr should have something that will work. search tubing. you will need to measure the size on the car.
can't give you exact part#s because I haven't replaced mine yet.
purchased some Arnott fittings from them for the BMW bags one year. if I remember right, they were a little higher quality.
McMasterCarr should have something that will work. search tubing. you will need to measure the size on the car.
can't give you exact part#s because I haven't replaced mine yet.
I have searched so much I am shocked I have not found Bigfoot or Emilia Erhart.
@CaliBenzDriver I promise the ones with the bevel ln both sides do NOT hold in the air lines.
the 3x brass rings on the left are for smooth copper pipe unions, right? Given higher torque they squeeze down a little to grab on hard pipes.
inner profile lip
The 2x right rings are specific for your application - Notice how the inside profile is not smooth. There is a lip that bites in the plastic hose for a tight seal.
That's all good except for the straight split is far from a 100% seal. straight cut edge... leaks pressure
The two halves get nearly sealed by coming in close contact -That is a guaranteed slow leak right there.
How to seal 100% the ring slot leak...
something has to be in there: silicongrease or RTV ??? (look up "pipe dope" : same principle with silicon)
I don't have a way to experiment using that solution.
At least what is clear is why these connectors leak either a little or a lot. Knowing that, yours don't have to!
what is the port type and size on the threaded size?
Looks like a Metric or maybe G (BSPP
What is max pressure in air lines?
Look online for Push to connect air line fittings.
So on one side is the mechanical thread connection and the other is just a place to shove in the airline where the fitting grabs, holds and seals airline.
Used a lot on on & off road trucks - Think Garbage trucks.
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