AB Box with 2 inputs & 2 outputs (isolated, active, buffered) - dpFX Pedals
Amazon.com: Guitar Pedal Power Supply, Asmuse 10 Isolated DC Output for 9V/12V/18V Guitar Bass Effects Pedals with Built-in USB Charging Port for Phone iPhone Pad iPad : Musical Instruments
Mix 2:1 - Radial Engineering
Belcat Singel Boost A B BOX ABS 522 with 2 Input & 1 Output Electric Guitar AB BOX Stompbox A ch, B ch Control|Guitar Parts & Accessories| - AliExpress
AB/XY for 2 Guitars and 2 Amps on Separate Channels : 7 Steps (with Pictures) - Instructables
Amazon.com: Rowin PW-1 Guitar Pedal Power Supply 10 Isolated DC Output for 9V/12V/18V Guitar Bass Effect Pedals with USB Charging port for iPhone iPad Tablet : Musical Instruments
Amazon.com: Donner DP-1 Guitar Power Supply 10 Isolated DC Output for 9V/12V/18V Effect Pedal : Musical Instruments
Morley ABY MIX 2-button Switcher/Mixer Pedal | Sweetwater
Boss RE-2 Space Echo Delay and Reverb Guitar Effects Pedal
1 input 2 output Buffer Multi-function Splitter for Electric Guitar Bass Effect | eBay
Amazon.com: Rowin PW-1 Guitar Pedal Power Supply 10 Isolated DC Output for 9V/12V/18V Guitar Bass Effect Pedals with USB Charging port for iPhone iPad Tablet : Musical Instruments