Entity / component disappears while rendering

Hi, I am a beginner.

I am making a water filter housing view. When i render in Vray, Entire blue filter housing disappears. Please see the pic and advice.

Please advice.

One possibility is you have reversed faces so the render is ignoring them.
Check by going, View/Face Style/Monochrome
if your tubes are showing as a blue/gray then you are seeing the back faces and need to reverse them.

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Thank you sir,
Solved my problem.

An excellent example of why face orientation can be important and why it is a good idea to keep up on correcting face orientation as you go.

And why many of us edit the style to use a garish color for the back face of the default material so that reversals are very conspicuous!

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