It’s just a tough flexible air hose line. I have hold downs on the center, back of the gantry that secures the tube.
This is a 12"x12" mirror, I think you can see it… you only need to watch a few seconds…
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thanks Jack…that hose gets a work out 
They must make a 6mm air hose that is designed for the Drag chain…
the one used in my Monport laser is a softer rubber than that of the typical stuff you find on Amazon as a roll of air hose… My typical Search’s don’t really come up with anything as there are bazillions of air hose out there and they jump in front of the searching…
but thanks for the clarity on your hose install…
I like the top mount capture of the Quick Release fitting
Adding “silicone” seems to improve the results:
https://www.amazon.com/s?k=6mm+silicone+hose
Distinguishing 6 mm ID and 6 mm OD is left to the discerning customer … 
It’s a rather hard type of plastic. Russ Sadler advised it’s use as it’s tough and long lasting even in this abusive application.
I changed the head out almost 5 years ago and have used that tubing since I lost the drag chain about that time…
Had to think about this, but I think the tubing is polyethylene - from Amazon.
These are mostly 6mmOD 4mmID for the typical fittings sorry for the non-information…
I have some silicone hose, when bending it tends to crimp over, so I thought there was something between silicone, and hard shell types…
This on amazon looks like a solution… but need it needs to be 6mmOD
if you watch the video it looks kink proof mostly…
https://www.amazon.com/gp/product/B078HWTCC5/ref=ox_sc_saved_title_2?smid=A14NZOKDOCWRV5&th=1
Just a few more pics… why ? its 5am and I am bored !
this is my air set up with the Monport air source(not shown) and the outside compressor supply coming in thru door, solenoid,air dryer, regulator etc…typical… goes to the head and to the Beam combiner on the laser tube.
just few more of the shop area,opposite the laser machine wall…
I have anotherstashof black acrylic sheets stored inthe bathroom for now…
waiting to move them…
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It looks very nice, congratulations.
Only but I want to put the screw holes in the dark/black areas.
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We had a Pastor come in the shop asking about amps and he played Harmonica, and asked about a Clock with Harmonica, so I made one..
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These are the best customers, (not necessarily church workers, but) people who know what they want and also buy it. Good job. 
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After we put the signd up out front, it started to get busy..
The only other AMP repair shop is about 70 miles away so lots
of retired musicians here in Florida with broke stuff in there closets.. I expect to be busy I suspect…
Lots of great folks retired, like to go to open mic at the local haunts..
some pretty good talent… 
Finally got around to fixing my exhaust tubing issue with a Wye adapter off the back of my laser…
mad a 5mm acrylic cover to go over both ports and then allow the flex hose to connect from the side.
this way I can get the Laser Tube cover open and also open the exhaust door as well…
I use a bead of silicon around the seal before screwing it in place
then use another side plate to sandwich the flex hose and hold it in place.
used Blue painters tape to make shift a ‘FIN’ around flex hose to sandwich and hold…
Now it is low profile and out of the way…a couple hours..
now is it finally finished and working good…Got rid of the WYE arms like ‘Robby the robot’
Much cleaner…
Let us know how that works out. I have my machine on rollers, so I disconnect the vent tube now and then. I was putting it back on and I guess I dropped a piece of acrylic into the hose… Engraved/cut a bunch of acrylic, then took the hose off to move it.. that part fell out. I noticed it was covered with acrylic dust much much worse than the actual line itself. It felt like it was stuck to the part.
Just wondering if it will show as contaminates after a while that will discolor the box?
Looks real nice.. 
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I did notice thereis ‘fuss’ build up in the flex hose, I did clean the fan a month back, some build up…
But yes will watch the box for any buildup and ‘parts’
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Well I finally added some algeacide to the water cooling (6-8 drops as it is a bigger tube), surprizing the water was still clear, no bubbles, and the level was perfect…
So I will keep an eye on it for another 3-4 months and see how it goes…
Bought a gallon of distilled water, keeping it in a cool dark space.
My son also uses it in his UV Printer to keep the UV Lamps cool… COOL ! 
There was never any bubbles with the algeacide, only the glycol antifreeze.
Sounds good… I have to install a new tube in mine … it’s sitting on the floor behind our couch.
Cool… pls take pictures and document the steps ( if there is time )
I normally don’t on something so simple.. this is my third tube for this machine. Original was about 43W, then when it failed I put a CR45 (45W), now that it’s output looks like a doughnut, I got a 50W from LightObject. I’m sure it’s a bit longer (1000mm, original was about 880mm), so will have to find some kind of extension.
Replaced the original OMTech tube mounts, in above photo, long before I had any tube issues.
Ended up with this one piece tube/mirror holder.
The part just left of center is a Hall effect flow meter.
Didn’t take many photos.
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Excellent… The Blue machine looks good…
I really like the Hold downs, good design…
I did notice you have the tube sitting back, 6-8" from Mirror #1…
I thought it was supposed to be a couple inches from mirror #1…
Never did understand Why… if you can shed light !
I noticed you still have the outflow fan in the exhaust port.
Q: is that your main exhaust fan ?
On my Monport it had two that I had to take out as they just hindered the suction from the external exhaust fan… but my table is 35 x 55 so alot more CF to pull.
I was watching the some engraving (wood) I was doing yesterday, and since I put the acrylic box on the back it seems to have increased the flow pull extensively.
The smoke would build up a bit then get pulled down and out.
Now it gets pulled down quickly… so I guess the box was a positive add-on 