31V Adapter - AC/DC adapter / power supply - UNICELL International Pte Ltd
Amazon.com: T-Power Charger for 31V DC HP PhotoSmart 2600 2610 2700 2710 OfficeJet Inkjet 2700 7200 7210 7300 7310 7400 7410 DeskJet 955C 959C Business Inkjet 1200d Ac Dc Adapter Power Supply Charger : Electronics
HP 0950 4340 POWER ADAPTER 45W 31V 1450mA OFFICEJET 6110 7550 | eBay
31V AC/DC Power Adapter Works with HP Officejet 7410 Printer Power Payless
0957-2171 HP AC Adapter (31v/ 2.42a/ 75w) With Power Cord for Business Inkjet 1200
Replacement Power supply for Xmas lights! - Electrical Engineering Stack Exchange