its called a HPA Refill Hose. it works like a remote line but the total opposite.
i found this website that has them but there out of stock. http://www.scenarioarms.com/HPARefillHose.html
so im wondering if norm has or can get this type of hose or if anyone else knows where i could get it. i think it would be an awesome seller at the field....
UPDATE- found another source here- http://www.amazon.com/Ninja-Paintball-Fill-Whip-Extension/dp/B001R7F4SI