Receptacle
Sorry if that was confusing; allow me to clarify.
The door in the construct's chest opens into an empty compartment, about the size of a shoebox. By 'receptacle', I was referring to this compartment itself. Sticking out from the back, near the top of the compartment, is what looks like a faucet. It extends straight out about halfway into the compartment, and then curves down about two inches. The spigot/faucet thing cannot be turned and has no other mechanical parts which can be operated.
The tubes are made of black rubber. There is one on either side, at the very bottom of the compartment/receptacle. Each is about two inches long and one inch in diameter. They do not contact the faucet, they are about eight inches from it, and cannot stretch that far either. Also, they cannot stretch to touch each either.
You examine the blacksmith's hammer. It looks like a trace amount of diamond dust is left on the hammer.
Neither Cinder nor the gods respond to your cries.