Hello everybody, I checked the inner dimension of Aluminum & Acrylic Tubes 4’’ and I notice that there is some minor difference: Aluminum Tube 4’ inner dimension: 100.65 Acrylic Tube 4’’ inner dimension: 101.19 (+/- 30) Is this difference affect the max depth rate of the two tubes? My concern i…

I find that it’s easier to put the flange in the acrylic tubes than it is to put the flange in the aluminum tube. I just add grease to the o-rings to make it easier.

Hi! How old are your ALU tubes? I have seen older tubes that seems to be a little bit more tight. Bo

Hello All, I converted from 4" acrylic to aluminum with considerable pain. I could not press the flanges on the aluminum tube the same way as the acrylic; by placing the dome end against my chest pushing from the rear flange. The solution was to: use new lubricated o-rings cut a 3 5/8" hole in m…

Hi @Larz : The flanges do fit very tightly in the 4" aluminum tube. But you shouldn’t have to go to that much trouble to get them installed. It helps if you use the hand vacuum pump to create a vacuum in the tube. It’s kind of a three-handed operation at first, you have to have the flanges presse…

Good tip with vaccum! For dismantling I have another tip: Unscrew 2 screws 180 degrees from each other holding the endplate to the O ring flange. Screw in 2 longer 3 mm screws, they now act as puller to “push” out the hole flange.

I have compared 4" alutube R1 with a new latest version R3 Inner sealing diameter is the same. But a difference is that R3 has an extra small 45 degree edge on the inside. That means it helps the O rings to not get cut, like the sharp 90 deg corner of R1 does.

Aluminum vs Acrylic Tube 4''

Blue Robotics Products Watertight Enclosures

gcelec (Geoff Cook - SeaView Systems) October 9, 2020, 2:59pm 4

I have used many of them for the last few years and I can’t say I’ve noticed a trend in them being looser or tighter.

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