Inflation devices for inflating objects with multiple sources of air

An inflation device, comprising:

• a body;
• a first pair of inlets configured to receive a first airflow;
• a valve configured to regulate the first airflow into the body through the first pair of inlets;
• a second pair of inlets configured to receive a second airflow separate from the first airflow;
• a flap configured to control the second airflow through the second pair of inlets;
• and
• an outlet, wherein:
• the first airflow and the second airflow exit the body through the outlet,
• in response to backflow into the outlet, the flap closes the second pair of inlets.

A method for inflating an object, the method comprising:

• receiving, by a valve of an inflation device, a first airflow at a first inlet;
• receiving, based on receiving the first airflow from the valve, a second airflow at a second inlet, wherein the second airflow is separate from the first airflow;
• providing, at an outlet, the first airflow and the second airflow to the object;
• and
• in response to receiving backflow through the outlet, closing, by a flap, the second inlet to block the second airflow.