The D120 printer design is very similar to some of the units that are coming out now such as these models:
* Artisan 50
* T50
* T60
* Workforce 30
* Workforce 40
Anyway, this modification guide provides all the information you need to complete a waste ink modification.
http://www.octoink.co.uk/kb/questions/62/Epson+D120
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Printers: (Canon) MP500/830, MX700, iP4000/4200/4300/4500/5200, iX4000(A3) (Epson) C84/86, D88, CX6600, R285/800/1900 (HP) K550, K850, K5400, L7680