In case you have a smoke device using these or any smoker you can fill remotely by this method. Just used a reservoir and (for the purpose of the test) a 6v water pump running as slowly as possible. Pump sucks fluid through the smoke tank from the reservoir and recirculates it back to same. Reservoir fluid level needs to be level with, or below the smoke tank inlets to avoid siphoning to the tank and flooding the wick. With this system it only takes a few seconds to fill. You could also use the same idea manually with a deck filler and overflow. Either system must be sealed (airtight) to avoid fluid draining from tank when not in use, ( Manual system - both tubes plugged after filling) This idea does away with disassembling E-pen to fill .
JB

Gave up trying to fit a smoke device in the HSL due to lack of room so decided to try something else. Set up the twin small air pumps (1 per exit) and made some y joints to link them to the pump and exhaust outlets,. Works reasonably well and not too noisy. Breaks up the flow a bit and gives it an 'exhaust flow look'.
JB