Update:
Looks like the one.
I always thought the greeblies that hang down from the grey hoses on the AT-AT helmets looked familiar but I couldn't put my finger on it.
Then it came to me... remember those cumbersome soda syphons (if you're a youngster you probably won't. )? Remember the part that held the gas cylinder which you inserted into the bottle and turned it to carbonate the water? That part is usually called the 'bulb holder'.
Could that be what they used?
Here's an example of one of these bulb holders (circled in red). This is just one example I found online. I know this isn't a very close match but there were probably many different variations available. The shape is similar though.
And here's the AT-AT greeblie:
The AT-AT ribbed tube would be inserted into the open end of the bulb holder that the gas cylinder would stick out of.
Looks like the one.
I always thought the greeblies that hang down from the grey hoses on the AT-AT helmets looked familiar but I couldn't put my finger on it.
Then it came to me... remember those cumbersome soda syphons (if you're a youngster you probably won't. )? Remember the part that held the gas cylinder which you inserted into the bottle and turned it to carbonate the water? That part is usually called the 'bulb holder'.
Could that be what they used?
Here's an example of one of these bulb holders (circled in red). This is just one example I found online. I know this isn't a very close match but there were probably many different variations available. The shape is similar though.
And here's the AT-AT greeblie:
The AT-AT ribbed tube would be inserted into the open end of the bulb holder that the gas cylinder would stick out of.