Expand Your World!
With DUPLO Creativity

Add 56 pieces of building possibilities to your DUPLO collection with this classic 1999 Supplementary Set.

LEGO Supplementary Set set 9123 - 56 pieces, Duplo and Explore theme, product photo Pin It
LEGO Supplementary Set set 9123
🏛 Duplo and Explore
Set #9123

Supplementary Set

Discover the Supplementary Set from the Duplo and Explore collection - 56 pieces of building excellence.

⏱ 30-60 min 🧩 56 pcs

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📦 Full Parts Inventory - 22 unique parts • 56 total pieces

Duplo Toolo Brick 2 x 8 with 2 Screws in Holes 2 and 6 Duplo Toolo Brick...
Part #: 31036c02 1× Blue
Duplo Toolo Arm 2 x 6 with Triangular Screw at Both Ends Duplo Toolo Arm 2...
Part #: 6279 6× Blue
Duplo Toolo Arm 2 x 10 with Angled Arm, with End Clip Duplo Toolo Arm 2...
Part #: 6281c01 2× Blue
Duplo Toolo Brick 2 x 2 with Angled Bracket with Forks and 2 Screws Duplo Toolo Brick...
Part #: 6284c01 2× Red
Duplo Toolo Brick with Screw 2 x 2, with Angled Arm with Clip Duplo Toolo Brick...
Part #: 6285 2× Red
Duplo Toolo Brick 2 x 5 with 8 Side Screw Sockets, Swivel Bracket End and Clip End Duplo Toolo Brick...
Part #: 6288c01 1× Red
Duplo Toolo Wheel with Connector Pin Duplo Toolo Wheel...
Part #: 6290 8× Black
Duplo Toolo Tyre / Tire Duplo Toolo Tyre ...
Part #: 6292 8× Black
Duplo Toolo Cabin Bottom Duplo Toolo Cabin...
Part #: 6293 1× Yellow
Duplo Toolo Arm with Fake Pulley and Hook Duplo Toolo Arm w...
Part #: 6295 1× Yellow
Duplo Toolo Hydro Nozzle Duplo Toolo Hydro...
Part #: 6363 2× Yellow
Duplo Hose with Yellow Nozzle and Stud Holder Duplo Hose with Y...
Part #: 6425c03 1× Black
Duplo Hose 11L with Stud Holder and Black Hose Duplo Hose 11L wi...
Part #: 6426c01 1× Yellow
Duplo Brick 2 x 2 Slope 45 with Medical Console Diagnostic or Locator Print Duplo Brick 2 x 2...
Part #: 6474pr9993 1× Red
Duplo Toolo Arm Turning with Set Screw End Duplo Toolo Arm T...
Part #: 6662c01 1× Red
Duplo Toolo Arm Turning with Clip End Duplo Toolo Arm T...
Part #: 6663c01 1× Red
Duplo Toolo Arm 2 x 11 with Triangular Set Screw End Duplo Toolo Arm 2...
Part #: 74844 4× Blue
Duplo Toolo Arm 2 x 6 with Triangular Set Screw and Clip Ends Duplo Toolo Arm 2...
Part #: 74847 6× Blue
Duplo Toolo Brick 2 x 8 with 10 Side Screw Sockets, Swivel Bracket End and Clip End Duplo Toolo Brick...
Part #: 74867 1× Blue
Duplo Toolo Brick 2 x 2 with Holes and Clip on Bottom Duplo Toolo Brick...
Part #: 74957 1× Yellow
🧱 Duplo Toolo Arm 2...
Part #: 6666c01 4× Blue
🧱 Duplo Toolo Winds...
Part #: 6672 1× Trans-Light Blue

🛒 Where to Buy

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📰 Duplo and Explore News

Supplementary Set News (1)

April 2026
Apr 28 BrickNerd

Divergent Ideas: How LEGO Themes Evolve
View all news
Notable Parts
Build Ideas

Related Articles

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

1 video found
BlockTalk AI

JediJACPenguin appreciates the Supplementary Set (9123-1) for its exclusive minifigures and detailed stickers, noting it's a visually appealing scenic build. The reviewer also mentions the packaging, specifically noting the tape on the side of the box.

YouTube thumbnail: LEGO STORE 2020 BLACK FRIDAY VIP WEEKEND HAUL!!!

LEGO STORE 2020 BLACK FRIDAY VIP WEEKEND HAUL!!!

JediJACPenguin • 1.0K views Unboxing
Community insights from Reddit discussions and YouTube reviews. Content may not reflect official LEGO positions.

What the Community Says

1 YouTube reviews
BlockTalk AI Summary

JediJACPenguin appreciates the Supplementary Set (9123-1) for its exclusive minifigures and detailed stickers, noting it's a visually appealing scenic build. The reviewer also mentions the packaging, specifically noting the tape on the side of the box.

Reddit Reviews

No Reddit reviews found

YouTube Reviews

1 video
YouTube thumbnail: LEGO STORE 2020 BLACK FRIDAY VIP WEEKEND HAUL!!!

LEGO STORE 2020 BLACK FRIDAY VIP WEEKEND HAUL!!!

JediJACPenguin
1.0K views Unboxing
Community Content: These reviews are from Reddit and YouTube users sharing their personal experiences. Opinions may vary.

Charts Inventory Statistics

22
Unique Parts
56
Total Pieces
0
Minifigures
Inventory Version: 1

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