Thoracic duct and Right lymphatic duct.
The two collecting ducts that drain the lymphatic system are the right and left subclavian veins.
Thoracic duct and the right lymphatic duct.

collecting duct (system) and late distal tubule

The larger and longer of the two lymphatic collecting ducts is the Thoracic Duct. The other collecting duct is the Right Lymphatic Duct.

There are many lymphatic vessels in the body, all of which, like the blood vessels, start as tiny capillaries and gradually get larger as they get nearer to the heart, until they eventually merge into one of the two collecting ducts.

The main collecting duct for the lymphatic system is the thoracic duct located alongside the aorta in the thoracic region of the body. Most lower body lymph (lymph from the front and back of both legs and the abdominal area) migrate to the thoracic duct then from the duct, lymph dumps into the left subclavian vein. The lymph then becomes part of the vascular system and the lymphatic process starts all over again.

No, the collecting duct is the site where the filtrate from multiple nephrons is collected and the final adjustments to urine concentration are made. The distal convoluted tubule drains into the collecting duct.