Can I replace two Siemens QP type, handle tied, single pole 15 amp breakers with a tandem QT type in the same configuration? - Home Improvement Stack Exchange
Siemens Q1520 15/20 Amp Dual Single Pole Plug-In Tandem Circuit Breaker Type QT 120 Volt
Siemens Part # Q2020U - Siemens 20 Amp Tandem Single Pole Type Qt Circuit Breaker - Circuit Breakers - Home Depot Pro
Siemens QP 15-Amp 2-Pole Tandem Circuit Breaker in the Circuit Breakers department at Lowes.com