1988 VRO 70 hp question

[sartobuilt]

I pulled the carbs off to rebuild. Below the lower carb there is a nipple in the intake that didnt have a hose connected to it.

Can someone tell me what should go there or if I need to put a cap on it. I checked arround and I dont see an extra hose laying arround.

[boats.net]

There is pulse fitting for fuel pump and a drain hose for air silencer.

[sartobuilt]

Thanks, for you help, its for the drain hose for the air silencer.