The Hosa YPP-106 is a very handy Y-Adaptor to keep around in your "just in case" audio toolbox. It has a 1/4" TS (mono, unbalanced) female on one end, and dual 1/4" TS (mono, unbalanced) males on the other. It is a perfect solution when you need to duplicate a mono 1/4" signal into two.
Y Adaptor Cable
1/4 in TS (Female) to Dual 1/4 in TS (Male)
Use to duplicate a mono signal
24 AWG OFC
1/4 in TSF to Dual 1/4 in TS
(1) Hosa 1/4" TS Female to Dual 1/4" TS Male Passive Splitting Adaptor