Throttle Body Heater Inlet Pipe has cracked on my Opel/Holden Astra-H 2008, engine Z18XER (chevrolet F18D4).

I need

Throttle Body Water Inlet Pipe 55354563

It will cost me about 40$


similar part 55574685. Suitable for Vauxhall Astra Insignia Cruze 1.6.

Is available only for 5$.

Would the cheap one suit my needs?

Why are they so different in price?

Based on eBay analysis.

For engine Z16XER / A16XER part 55354563 may be replaced with 25192904, 55559352, 55569809, 55574685.

For engine Z18XER, part 55354563 may be replaced with 25192905, 5826481, 5826487.


Sellers claim that 55574685/25192904/55559352 is fine for Z18XER if only it comes from Zafira-B, but if you have Astra-H it will only fit Z16XER/A16XER (and not Z18XER).


  • It seems they are two separate engines. Isn't one a 1.8 and the other a 1.6? I dont have access now, so cannot crosscheck yet. Commented May 14, 2019 at 16:10
  • Yes, mine engine is 1.8 and and the other one engine code is not clear. Where I look for z16xer engine part, I'm getting again 55354563 which is 40$. Where the 5$ one came from and why is it cheaper - is still a question. Commented May 14, 2019 at 22:47
  • 1
    @Pᴀᴜʟsᴛᴇʀ2 , I did it, it is working. hurray. Commented Jun 6, 2019 at 0:21

1 Answer 1


ok I have bought 55574685 for about $5.00 with free postage.

And install it on my Astra H 2008 wagon all right.

Just one more thing you should know.

the connector on the thermostat side is not quite the same, thus - if you have old one working, - great, you will have no worries.

If your one is broken, like in my case, you'll need a file (I used it) or a sand paper (or a knife sharpening stone) to make the side flat on the other side. See picture to see how the connector is flat on one side and round on the other?

enter image description here

well, in my case it was flat on the wring side, but, it is not important, because the rubber washer is way above this flat part of connector.

Anyway, it has been a week with no leak already.

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