GT-81081-6015-T3 is a power supply that is not currently sold by Digi-Key. Based on the specifications available, Digi-Key part number 102-3814-ND has been suggested as a replacement.
Voltage Input 90-264VAC (Input cable sold separately)
Voltage Output 15VDC
Current Output 4.3A
Connector Barrel Plug 2.5mm ID, 5.5mm OD x 9.5mm Positive Center
For further information see manufacturer data sheet on the product page.