High-temperature air duct Y connector 75 x 60 x 60 mm. If your system is using 60mm ducting you will need a 75mm to 60mm reducer to make this work for you! You can find that reducer here.
2D-12 Heaters use 60mm ducting/connectors and vents
4B, 4D, 44D use 3" ducting and connectors- Please make sure you purchase the correct configuration of ducting parts! Reach out to us if you have questions!