Is it possible to replace the sample port? If so, where could I get the part?
You don't say what brand or model you are talking about.
its a nuaire ir air flow - co2 water jacketed incubator. not sure what the model number is.
I guess that by sample port, you are talking about a small diameter tube through the wall of the chamber. This is normally used for an independent gas probe , temperature probe or maybe a tubing line to/from a pump
For a water-jacketed model, the sample port is a water-tight integral part of the instrument. I have not heard of one being replaced. Is it corroded?
I suggest that you contact Nuaire. You do not say which country you are calling from. If it is the US, then contact them on 800-328-3352 otherwise (and also possible for US) use the contact form http://www.nuaire.com/contact-us/service-inquiries.php and they will put you in touch with your local dealer.
Hope this helps,