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LEGO Missing Piece Checker

Enter a set number, mark each piece found or missing, and leave with a list of what is missing, the element IDs LEGO asks for and links to buy the parts. It is free and needs no account. Rule out the usual hiding places first.

Universal Pneumatic Set

Checking

8042 Universal Pneumatic Set

240 pieces in 66 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.

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Piece checklist

Plates 39 pieces

  • Plate 1 x 1 Blue Part 3024 Element 302423 ×2
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×13
  • Plate 1 x 3 Blue Part 3623 Element 362323 ×2
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×7
  • Plate 1 x 6 Blue Part 3666 Element 366623 ×2
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×2
  • Plate 2 x 2 Corner Blue Part 2420 Element 242073 or 242023 ×4
  • Plate 2 x 6 Blue Part 3795 Element 379523 ×1
  • Plate 4 x 6 Blue Part 3032 Element 303223 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×2
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×2

Technic Pins 36 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×18
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×6
  • Technic Pin 1/2 without Friction Ridges Light Gray Part 4274 Element 427402 ×2
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×10

Technic Bricks 34 pieces

  • Technic Brick 1 x 10 [9 Pin Holes] Blue Part 2730 Element 273023 ×2
  • Technic Brick 1 x 12 [11 Pin Holes] Blue Part 3895 Element 389523 ×4
  • Technic Brick 1 x 16 [15 Pin Holes] Blue Part 3703 Element 370323 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Blue Part 3700 Element 370023 ×12
  • Technic Brick 1 x 4 [3 Pin Holes] Blue Part 3701 Element 370123 ×6
  • Technic Brick 1 x 6 [5 Pin Holes] Blue Part 3894 Element 389423 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Blue Part 3702 Element 370223 ×4

Technic Bushes 27 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×12
  • Technic Bush 1/2 Toothed Type II [X Opening] Light Gray Part 4265b Element 4100501 or 657702 ×15

Technic Axles 22 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×3
  • Technic Axle 2 Black Part 3704 Element 370426 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×4
  • Technic Axle 6 Black Part 3706 Element 370626 ×6
  • Technic Axle 8 Black Part 3707 Element 370726 ×5

Tubes and Hoses 12 pieces

  • Hose, Pneumatic 4mm D. 12L / 9.6cm Black Part 5102c12 Element 4529099 ×1
  • Hose, Pneumatic 4mm D. 20L / 16cm Black Part 5102c20 Element 6352200 or 4563307 ×2
  • Hose, Pneumatic 4mm D. 7L / 5.6cm Black Part 5102c07 ×3
  • Hose, Pneumatic 4mm D. 9L / 7.2cm Black Part 5102c09 Element 6119405 ×2
  • Hose, Pneumatic 4mm D. 19L / 15.2cm Light Gray Part 5102c19 Element 4107576 or 4107201 ×1
  • Hose, Pneumatic 4mm D. 3L / 2.4cm Light Gray Part 5102c03 ×1
  • Hose, Pneumatic 4mm D. 5L / 4cm Light Gray Part 5102c05 ×1
  • Hose, Pneumatic 4mm D. 7L / 5.6cm Light Gray Part 5102c07 ×1

Technic Beams 10 pieces

  • Technic Beam Triangle Thin [Type I] Black Part 2905 Element 4142543 or 290526 ×2
  • Technic Beam 1 x 4 Thin with Stud Connector Light Gray Part 2825 Element 4107133 or 282502 ×8

Technic Connectors 10 pieces

  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 ×4
  • Technic Axle and Pin Connector Toggle Joint Toothed [with Slots] Light Gray Part 4273b Element 427302 ×6

Hinges, Arms and Turntables 8 pieces

  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs Blue Part 4276b Element 4238854 or 4114247 ×4
  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Blue Part 4275b Element 4239024 or 427523 ×4

Wheels and Tyres 8 pieces

  • Tyre 24 x 13 Model Team Black Part 2696 Element 269676 or 269626 ×4
  • Wheel 30 x 13 Model Team White Part 2695 Element 4507077 or 4240315 ×4

Plates Special 7 pieces

  • Technic Plate 2 x 4 [3 Holes] Blue Part 3709 Element 370923 ×4
  • Technic Plate 2 x 8 [7 Holes] Blue Part 3738 Element 373823 ×2
  • Technic Plate 2 x 4 [3 Holes] White Part 3709 Element 370901 ×1

Technic Gears 7 pieces

  • Technic Gear 14 Tooth Bevel Light Gray Part 4143 Element 414352 or 414302 ×2
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Gray Part 4019 Element 4107176 or 401902 ×2
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×2
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×1

Pneumatics 6 pieces

  • Pneumatic Switch with Top Studs Light Gray Part 75215 Element 4190775 or 75215 ×2
  • Pneumatic T-Piece (T Bar) [Old Style] Light Gray Part 4697a ×1
  • Pneumatic Cylinder 1 x 5 with 2 Inlets Yellow Part 74981 Element 6005292 or 4625540 ×1
  • Pneumatic Cylinder with 2 Inlets Medium (48mm) with Black Top Yellow Part 2793c01 Element 4190836 or 74721 ×1
  • Pneumatic Pump New Style with Black Top Yellow Part 2797c02 Element 4563134 or 74720 ×1

Technic Special 5 pieces

  • Technic Plate 1 x 6 with Toothed Ends Light Gray Part 4262 Element 4240413 or 4109661 ×2
  • Technic Plate 1 x 8 with Toothed Ends Light Gray Part 4442 Element 444252 or 444202 ×3

Bricks Sloped 2 pieces

  • Brick Sloped Inverted 45° 2 x 1 Blue Part 3665 Element 366523 ×2

Technic Steering, Suspension and Engine 2 pieces

  • Technic Steering Arm Light Gray Part 4261 Element 4225506 or 4189316 ×2

Tiles 2 pieces

  • Tile 1 x 2 with Groove Light Gray Part 3069b Element 306902 ×2

Bricks Round and Cones 1 piece

  • Brick Round 2 x 2 with Axle Hole Trans-Yellow Part 3941 Element 6514285 or 6273155 ×1

Plates Round Curved and Dishes 1 piece

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Yellow Part 4032a Element 403224 ×1

Tiles Round and Curved 1 piece

  • Tile Round 2 x 2 with Bottom Cross Yellow Part 4150 Element 415074 or 415024 ×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.

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