BlockTalk Find Your Set

Free tool

LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Underwater Robot

Checking

31090 Underwater Robot

207 pieces in 81 part and color combinations.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

Show

Piece checklist

Plates Special 44 pieces

  • Plate Special 1 x 1 Rounded with Handle Black Part 26047 Element 6157554 ×2
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Black Part 60478 Element 4515368 ×1
  • Plate Special 1 x 2 with Pin Hole on Top Black Part 11458 Element 6114987 ×8
  • Plate Special 2 x 2 with Bar Frame Octagonal, Reinforced, Completely Round Studs Black Part 75937 Element 6018805 ×1
  • Bracket 1 x 1 - 1 x 1 Inverted Dark Bluish Gray Part 36840 Element 6225494 ×2
  • Plate Special 1 x 2 with 5.9mm Centre Side Towball Dark Bluish Gray Part 14417 Element 6414560 or 6338160 ×1
  • Bracket 1 x 2 - 2 x 2 Inverted Light Bluish Gray Part 99207 Element 4654580 ×7
  • Plate Special 1 x 2 5.9mm Towball Socket Light Bluish Gray Part 14418 Element 6414556 or 6338163 ×2
  • Plate Special 1 x 2 with Pin Hole Underneath Light Bluish Gray Part 18677 Element 6168633 or 6089147 ×2
  • Bracket 1 x 1 - 1 x 1 Medium Blue Part 36841 Element 6248079 or 6236112 ×4
  • Plate Special 1 x 2 with Clip Horizontal on Side White Part 11476 Element 6313115 or 6070712 ×5
  • Plate Special 1 x 2 with Handles on Ends White Part 18649 Element 6615560 or 6249273 ×1
  • Technic Plate 2 x 4 [3 Holes] White Part 3709 Element 370901 ×4
  • Plate Special 3 x 2 with Rounded End, Hole Yellow Part 3176 Element 4188313 or 4141738 ×4

Plates 27 pieces

  • Plate 2 x 2 Dark Blue Part 3022 Element 6037890 or 4528982 ×1
  • Plate 1 x 4 Dark Bluish Gray Part 3710 Element 4211001 ×4
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×5
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×1
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×4
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×4
  • Plate 2 x 3 Yellow Part 3021 Element 302124 ×6
  • Plate 2 x 4 Yellow Part 3020 Element 302024 ×2

Technic Pins 17 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×2
  • Technic Rotation Joint Ball Loop with Two Perpendicular Pins with Friction Black Part 47455 Element 4272426 or 4213374 ×6
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×2
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×4
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Dark Bluish Gray Part 11214 Element 6015356 ×2
  • Technic Axle Towball Light Bluish Gray Part 2736 Element 6443149 or 4211375 ×1

Bricks Curved 14 pieces

  • Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Blue Part 11477 Element 6554198 or 6094143 ×4
  • Brick Arch 1 x 3 x 2 Curved Top Yellow Part 6005 Element 4652261 or 4502067 ×4
  • Brick Curved 2 x 2 x 2/3 Yellow Part 15068 Element 6079007 ×2
  • Brick Curved 4 x 2 No Studs Yellow Part 93606 Element 6079001 ×2
  • Brick Curved Inverted 2 x 1 Yellow Part 24201 Element 6167223 ×2

Bricks Sloped 12 pieces

  • Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate Black Part 61409 Element 4541191 ×4
  • Brick Sloped 30° 1 x 2 x 2/3 Light Bluish Gray Part 85984 Element 4568637 ×2
  • Brick Sloped 45° 2 x 4 Yellow Part 3037 Element 4219911 or 303724 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Yellow Part 3660 Element 366024 ×4

Technic Special 11 pieces

  • Technic Brick Special 2 x 2 with Pin Hole, with 2 Rotation Joint Sockets Black Part 48172 Element 6296186 or 4275826 ×1
  • Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Ball Half [Vertical Side] Dark Bluish Gray Part 48171 Element 6492115 or 6343337 ×6
  • Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Socket Dark Bluish Gray Part 48169 Element 6278974 or 4225973 ×4

Bricks Round and Cones 8 pieces

  • Brick Round 4 x 4 Centre Hole Black Part 87081 Element 4558957 ×1
  • Brick Round 2 x 2 with Axle Hole Dark Bluish Gray Part 3941 Element 4249139 ×3
  • Brick Round 2 x 2 Dome Top, Hollow Stud Red Part 30367c Element 4216657 ×2
  • Brick Round 2 x 2 x 2 Robot Body, Axle Holder '+' Orientation Red Part 30361c Element 6251169 or 6173050 ×2

Plates Round Curved and Dishes 8 pieces

  • Plate Round Half 3 x 6 with 1 x 2 Cutout Light Bluish Gray Part 18646 Element 6132983 ×2
  • Plate Round 1 x 1 with Open Stud Pearl Gold Part 85861 Element 6190252 or 6141499 1 spare in the box ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Tan Part 4032a Element 4140562 or 403205 ×3
  • Dish 2 x 2 Inverted [Radar] Trans-Neon Orange Part 4740 Element 6245295 or 3006347 ×2

Tiles 7 pieces

  • Tile 1 x 2 with Groove Dark Blue Part 3069b Element 6554190 or 4528488 ×1
  • Tile 1 x 2 with Gauges, '82', and Buttons Print Light Bluish Gray Part 3069bpr0301 Element 6329585 ×1
  • Tile 2 x 2 Corner Light Bluish Gray Part 14719 Element 6065824 ×4
  • Tile 2 x 2 with Groove Light Bluish Gray Part 3068b Element 4211413 ×1

Tiles Round and Curved 6 pieces

  • Tile Round 2 x 2 with Bottom Stud Holder Dark Bluish Gray Part 14769 Element 6056296 or 4620079 ×4
  • Tile Round 1 x 1 Trans-Light Blue Part 98138 Element 6514192 or 6274739 1 spare in the box ×2

Tiles Special 6 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Light Bluish Gray Part 2412b Element 4211350 ×2
  • Tile Special Round 2 x 2 with Hole Light Bluish Gray Part 15535 Element 6179186 ×3
  • Tile Special 1 x 2 with Handle Red Part 2432 Element 243221 ×1

Bars, Ladders and Fences 4 pieces

  • Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Dark Bluish Gray Part 48729b Element 6278155 or 4579234 1 spare in the box ×1
  • Bar 4L (Lightsaber Blade / Wand) White Part 30374 Element 6116602 or 4129836 ×2
  • Bar Holder with Clip White Part 11090 Element 6341465 or 6136789 ×1

Bricks 4 pieces

  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×1
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×3

Bricks Special 4 pieces

  • Brick Special 1 x 1 with Clip Horizontal Black Part 60476 Element 6320309 or 4535765 ×4

Flags, Banners and Signs 4 pieces

  • Flag 2 x 2 Trapezoid with Flat Area between Clips Dark Blue Part 44676 Element 4529551 or 4261792 ×4

Large Buildable Figures 4 pieces

  • Large Figure Weapon Claw, with Clip Flat Silver Part 92220 Element 6214125 or 4659335 ×4

Windows and Doors 4 pieces

  • Window 1 x 2 x 2 Plane, Hollow Studs, Single Hole Top and Bottom for Glass Yellow Part 60032 Element 6249279 or 6153842 ×4

Hinges, Arms and Turntables 3 pieces

  • Hinge Cylinder 1 x 2 Locking with 1 Finger and Axle Hole On Ends Dark Bluish Gray Part 30552 Element 4210694 ×2
  • Turntable 4 x 4 Square Base, Locking Light Bluish Gray Part 61485 Element 6045718 or 4523670 ×1

Minifig Upper Body 3 pieces

  • Arm Mechanical with Clip [Thick Support] Black Part 98313 Element 6276867 or 6006739 ×3

Transportation - Land 3 pieces

  • Grille / Spoiler with 1 x 2 Plate, 2 x 2 Anti-studs (Racers Car) White Part 50949 Element 6249277 ×1
  • Spoiler 2 x 4 with Handle [Plain] Yellow Part 98834 Element 6539770 or 6103399 ×2

Animal / Creature Body Parts 2 pieces

  • Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Black Part 53451 Element 6270103 or 4568385 1 spare in the box ×1
  • Creature Body Part, Horn (Unicorn) Flat Silver Part 89522 Element 6214214 or 4612829 1 spare in the box ×1

Rock 2 pieces

  • Rock 1 1/3 x 1 1/3 x 1 Pearl Gold Part 35646 Element 6207259 ×2

Technic Beams 2 pieces

  • Technic Beam 1 x 3 Thick Red Part 32523 Element 4153718 ×2

Technic Connectors 2 pieces

  • Technic Axle and Pin Connector Angled #1 Red Part 32013 Element 6332580 or 4254606 ×2

Tubes and Hoses 2 pieces

  • Flexible Ribbed Hose 8mm Ends 19L Flat Silver Part 57539 Element 6044636 or 4615232 1 spare in the box ×2

Plants & Trees 1 piece

  • Plant, Sea Grass Dark Green Part 30093 Element 6269984 or 4569217 ×1

Technic Axles 1 piece

  • Technic Axle 5 with Stop Reddish Brown Part 15462 Element 6159763 ×1

Wheels and Tyres 1 piece

  • Wheel 18 x 14 with Pin Hole, Fake Bolts and Shallow Spokes Yellow Part 55981 Element 6109681 or 4490142 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 6 x 6 x 3 Canopy Half Sphere with Dual 2 Fingers Trans-Clear Part 50747 Element 4624369 or 4530764 ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

We value your privacy

We use cookies 🍪 for analytics and to improve your experience. Read our privacy policy