The ink system in those printers is relatively simple. I found this related to the T120:https://support.hp.com/us-en/product/hp-designjet-t120-printer/5263073/document/c04525354Maybe you can find a support page specific to your series printer. Certainly the manual wi...
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Type:Routin Maintenance Item;Product name:Continuous Ink Supply System;Model:T120 T520;Condition:Compatible and NEW;Part Number:#;Size:24inch and 42inch;Packing:Neutral Packing;Payment term:Paypal T/T Western Union Money Gram;Delivery:DHL FedEx UPS TNT