Watertight Enclosure Tubes

Blue Robotics

Watertight Enclosure Tubes

€25.00€31.38Excl. VAT — added at checkoutIncl. 25.5% VAT (Finland) — final VAT is calculated at checkout

Ordered for you — ships in about 7 business days

SKU BR-100230-101

  • Delivery across Europe from Finland, other countries on request
  • Not sure it fits your build? Ask us — we build on the same platform.

Description

These 2″, 3″, 4″, 5″, 6″, and 8″ locking tubes are available in a variety of lengths and in both cast acrylic plastic and anodized 6061-T6 aluminum. These tubes are a substantial upgrade over the first generation of watertight enclosure tubes.

Both the acrylic and aluminum tube options have precision machined O-ring interfaces at each end, ensuring a consistent and reliable fit with the sealing flange. A smooth surface finish ensures proper sealing between the O-ring flange and the tube. Also machined into the ends is a gland for a locking cord and a slot for cord insertion. You can read more about the locking feature and see a diagram of how it works on the main watertight enclosure product page.

The slot for cord insertion doubles as an anti-rotation feature, mating with a feature on the flange. This keeps the flange in a consistent orientation with the tube and prevents the user from rotating the flange and damaging anything inside the enclosure.

The tubes are available individually here, but you can configure a complete watertight enclosure from the watertight enclosure configuration page.

Because of the precision machined interface, the tubes are no longer available in custom lengths.

Precision machined tube ends.
Tube with flange installed.

What's in the box

  • 1 x Tube (based on selection)

Technical details

Specifications

Drawing
Series DiameterTube Material/FinishTube ID (A)Tube OD (B)Overall Length¹ (C)WeightDepth Rating ²Part Number
50 mm
(2")		Aluminum 6061-T6, type III anodized50.0 ± 0.5 mm58.0 ± 0.2 mm100 mm169 g1000 mBR-106277-100
150 mm261 gBR-106277-150
300 mm536 gBR-106277-300
Cast Acrylic49.5 ± 1.5 mm58.0 ± 0.5 mm
100 mm75 g225 mBR-100230-101
150 mm115 g130 mBR-100230-151
300 mm238 g100 mBR-100230-301
75 mm
(3")		Aluminum 6061-T6, type III anodized79.0 ± 0.5 mm86.5 ± 0.3 mm150 mm328 g1000 mBR-106278-150
240 mm530 gBR-106278-240
300 mm665 gBR-106278-300
400 mm890 gBR-106278-400
Cast Acrylic76.2 ± 2.0 mm88.9 ± 0.7 mm150 mm264 g275 mBR-102649-150
240 mm442 g150 mBR-102649-240
300 mm560 g135 mBR-102649-300
400 mm758 g120 mBR-102649-400
100 mm
(4")		Aluminum 6061-T6, type III anodized103.0 ± 0.5 mm112.0 ± 0.3 mm200 mm707 g1000 mBR-106279-200
300 mm1066 gBR-106279-300
400 mm1426 g900 mBR-106279-400
Cast Acrylic101.6 ± 2.1 mm114.3 ± 0.8 mm200 mm488 g140 mBR-101052-200
300 mm746 g100 mBR-101052-300
400 mm1004 g60 mBR-101052-400
130 mm
(5")		Aluminum 6061-T6, type III anodized130 ± 0.5 mm138.7 ± 0.3 mm300 mm1450 g1000 mBR-106280-300
500 mm2441 g650 mBR-106280-500
150 mm
(6")		Aluminum 6061-T6, type III anodized150 ± 0.5 mm163.9 ± 0.3 mm300 mm2510 g800 mBR-106281-300
500 mm4360 gBR-106281-500
200 mm
(8")		Aluminum 6061-T6, type III anodized200 ± 0.5 mm214.2 ± 0.3 mm300 mm3420 g800 mBR-106282-300
500 mm5915 gBR-106282-500
¹ Overall length tolerance is ± 0.5 mm.
² The depth ratings for cast acrylic components are applicable only for short-term submersions lasting less than two weeks. For longer submersion, we suggest using aluminum components only.

HS Codes

Tube MaterialHS Code
Acrylic Tubes3917.32.0050
Aluminum Tubes7608.20.0090

3D Models

WTE2_ACRYLIC_TUBES_BR-100230-XXX (.zip)

WTE2_ALUMINUM_TUBES_BR-106277-XXX (.zip)

WTE3_ACRYLIC_TUBES_BR-102649-XXX (.zip)

WTE3_ALUMINUM_TUBES_BR-106278-XXX (.zip)

WTE4_ACRYLIC_TUBES_BR-101052-XXX (.zip)

WTE4_ALUMINUM_TUBES_BR-106279-XXX (.zip)

WTE5_ALUMINUM_TUBES_BR-106280-XXX (.zip)

WTE6_ALUMINUM_TUBES_BR-106281-XXX (.zip)

WTE8_ALUMINUM_TUBES_BR-106282-XXX (.zip)

Revision History

8 April 2026

  • BR-106277-100, Aluminum - 50 mm (2") 100 mm
    • Racking grooves removed from internal diameter
  • BR-106277-150, Aluminum - 50 mm (2") 150 mm
    • Racking grooves removed from internal diameter
  • BR-106277-300, Aluminum - 50 mm (2") 300 mm
    • Racking grooves removed from internal diameter
  • BR-106278-150, Aluminum - 75 mm (3") 150 mm
    • Racking grooves removed from internal diameter
  • BR-106278-240, Aluminum - 75 mm (3") 240 mm
    • Racking grooves removed from internal diameter
  • BR-106278-300, Aluminum - 75 mm (3") 300 mm
    • Racking grooves removed from internal diameter
    • Depth rating increased from 900 to 1000 m
  • BR-106278-400, Aluminum - 75 mm (3") 400 mm
    • Racking grooves removed from internal diameter
    • Depth rating increased from 750 to 1000 m
  • BR-106279-200, Aluminum - 100 mm (4") 200 mm
    • Racking grooves removed from internal diameter
  • BR-106279-300, Aluminum - 100 mm (4") 300 mm
    • Racking grooves removed from internal diameter
  • BR-106279-400, Aluminum - 100 mm (4") 400 mm
    • Racking grooves removed from internal diameter
    • Depth rating increased from 800 to 900 m
  • BR-106280-300, Aluminum - 130 mm (5") 300 mm
    • Racking grooves removed from internal diameter
  • BR-106280-500, Aluminum - 130 mm (5") 500 mm
    • Racking grooves removed from internal diameter
    • Depth rating increased from 500 to 650 m
  • BR-106281-300, Aluminum - 150 mm (6") 300 mm
    • Racking grooves removed from internal diameter
    • Depth rating increased from 500 to 650 m
  • BR-106281-500, Aluminum - 150 mm (6") 500 mm
    • Racking grooves removed from internal diameter
    • Depth rating decreased from 1000 to 800 m
  • BR-106282-300, Aluminum - 200 mm (8") 300 mm
    • Racking grooves removed from internal diameter
    • Depth rating decreased from 1000 to 800 m
  • BR-106282-500, Aluminum - 200 mm (8") 500 mm
    • Racking grooves removed from internal diameter
    • Depth rating decreased from 1000 to 800 m

8 September 2025

  • BR-100534-300, Aluminum - 50 mm (2") 300 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-100611-400, Aluminum - 75 mm (3") 400 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-100195-300, Aluminum - 100 mm (4") 300 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-100195-400, Aluminum - 100 mm (4") 400 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-101409-300, Aluminum - 130 mm (5") 300 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-101411-500, Aluminum - 150 mm (6") 500 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-101412-300, Aluminum - 200 mm (8") 300 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-101412-500, Aluminum - 200 mm (8") 500 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing

9 April 2025

  • BR-100534-100, Aluminum - 50 mm (2") 100 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-100611-150, Aluminum - 75 mm (3") 150 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-100611-240, Aluminum - 75 mm (3") 240 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-100195-200, Aluminum - 100 mm (4") 200 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-101409-500, Aluminum - 130 mm (5") 500 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing
  • BR-101411-300, Aluminum - 150 mm (6") 300 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing

21 January 2025

  • BR-100611-300, Aluminum - 75 mm (3") 300 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing

3 January 2025

  • BR-100534-150, Aluminum - 50 mm (2") 150 mm
    • Racking grooves added to internal diameter
    • Updated to type III anodizing

10 December 2024

  • BR-101066, Cast Acrylic Plastic - 75 mm (3") 150 mm part number changed to BR-102649-150

5 November 2024

  • BR-100352, Cast Acrylic Plastic - 75 mm (3") 240 mm part number changed to BR-102649-240
  • BR-100293, Cast Acrylic Plastic - 75 mm (3") 400 mm part number changed to BR-102649-400

29 October 2024

  • BR-100895, Cast Acrylic Plastic - 75 mm (3") 300 mm part number changed to BR-102649-300

7 February 2024

  • BR-101409-300, Aluminum - 130 mm (5") 300 mm - Initial release
  • BR-101409-500, Aluminum - 130 mm (5") 500 mm - Initial release
  • BR-101411-300, Aluminum - 150 mm (6") 300 mm - Initial release
  • BR-101411-500, Aluminum - 150 mm (6") 500 mm - Initial release
  • BR-101412-300, Aluminum - 200 mm (8") 300 mm - Initial release
  • BR-101412-500, Aluminum - 200 mm (8") 500 mm - Initial release

14 June 2023

  • WTE4-M-LOCKING-TUBE-200-R2-RP SKU changed to BR-100195-200
  • WTE4-M-LOCKING-TUBE-300-R2-RP SKU changed to BR-100195-300
  • WTE4-M-LOCKING-TUBE-400-R2-RP SKU changed to BR-100195-400
  • WTE4-P-LOCKING-TUBE-200-R2-RP SKU changed to BR-101052-200
  • WTE4-P-LOCKING-TUBE-300-R2-RP SKU changed to BR-101052-300
  • WTE4-P-LOCKING-TUBE-400-R2-RP SKU changed to BR-101052-400

8 June 2023

  • WTE3-P-LOCKING-TUBE-150-R2-RP SKU changed to BR-101066
  • WTE3-P-LOCKING-TUBE-240-R2-RP SKU changed to BR-100352
  • WTE3-P-LOCKING-TUBE-300-R2-RP SKU changed to BR-100895
  • WTE3-P-LOCKING-TUBE-400-R2-RP SKU changed to BR-100293
  • WTE3-M-LOCKING-TUBE-150-R2-RP SKU changed to BR-100611-150
  • WTE3-M-LOCKING-TUBE-240-R2-RP SKU changed to BR-100611-240
  • WTE3-M-LOCKING-TUBE-300-R2-RP SKU changed to BR-100611-300
  • WTE3-M-LOCKING-TUBE-400-R2-RP SKU changed to BR-100611-400

1 June 2023

  • WTE2-P-LOCKING-TUBE-100-R1-RP SKU changed to BR-100230-101
  • WTE2-P-LOCKING-TUBE-150-R1-RP SKU changed to BR-100230-151
  • WTE2-P-LOCKING-TUBE-300-R1-RP SKU changed to BR-100230-301
  • WTE2-M-LOCKING-TUBE-100-R2-RP SKU changed to BR-100534-100
  • WTE2-M-LOCKING-TUBE-150-R2-RP SKU changed to BR-100534-150
  • WTE2-M-LOCKING-TUBE-300-R2-RP SKU changed to BR-100534-300

18 May 2022

  • WTE3-P-LOCKING-TUBE-150-R2 - Initial release
  • WTE3-P-LOCKING-TUBE-240-R2 - Initial release
  • WTE3-P-LOCKING-TUBE-300-R2 - Initial release
  • WTE3-P-LOCKING-TUBE-400-R2 - Initial release
  • WTE3-M-LOCKING-TUBE-150-R2 - Initial release
  • WTE3-M-LOCKING-TUBE-240-R2 - Initial release
  • WTE3-M-LOCKING-TUBE-300-R2 - Initial release
  • WTE3-M-LOCKING-TUBE-400-R2 - Initial release
  • WTE4-P-LOCKING-TUBE-200-R2 - Initial release
  • WTE4-P-LOCKING-TUBE-300-R2 - Initial release
  • WTE4-P-LOCKING-TUBE-400-R2 - Initial release
  • WTE4-M-LOCKING-TUBE-200-R2 - Initial release
  • WTE4-M-LOCKING-TUBE-300-R2 - Initial release
  • WTE4-M-LOCKING-TUBE-400-R2 - Initial release

Documentation

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