Dear Luke Harvey;

here you can find some suppliers

https://www.antslab.in/how-to-use-hydrothermal-reactor/

https://www.alibaba.com/product-detail/Hydrothermal-Synthesis-Reactors-with-ptfe-liner_60562358959.html

https://www.toptionlab.com/Hydrothermal-synthesis-reactor/100ml-teflon-lined-hydrothermal-reactor.html

I recommend you the below company.They have a lot of experience for the field and may suceed to Dupout technology.

NIPPON FUSSO CO.,LTD. 2-4-6, Mokuzaidori, Miharaku, Sakai, Osaka Postal Code: 587-0042 TEL +81-72-361-3391 FAX +81-72-363-1230