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.

Lloyd's Hydro Mech

Checking

71750 Lloyd's Hydro Mech

220 pieces in 105 part and color combinations, plus 2 minifigures.

The official piece count includes the 9 parts inside the set's minifigures, which this inventory lists separately; the remaining difference of 1 piece is within the tolerance of the catalog data.

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

Black 75 pieces

  • Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Black Part 48729b Element 6278152 or 6037347 1 spare in the box ×1
  • Bar 6L with Stop Ring Black Part 63965 Element 6170421 or 6081988 ×1
  • Bar Holder with Clip Black Part 11090 Element 6315887 or 6015891 ×2
  • Bracket 1 x 2 - 1 x 4 [Rounded Corners at Bottom, Square Corners at Top] Black Part 28802 Element 6168620 ×2
  • Bracket 1 x 2 - 2 x 2 Inverted Black Part 99207 Element 6000650 ×2
  • Bracket 5 x 2 x 1 1/3 with Holes, Pin Bottom Black Part 11215 Element 6039194 ×1
  • Brick Curved 2 x 2 x 2/3 Black Part 15068 Element 6053077 ×4
  • Brick Curved 4 x 1 Double, No Studs Black Part 93273 Element 4613153 ×1
  • Brick Curved 4 x 3 with 3 Layers, 1 x 3 Cutout on Underside Black Part 66955 Element 6301371 ×3
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Black Part 3747b Element 4500458 or 374726 ×2
  • Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×2
  • Brick Wedged, Curved 2 x 3 x 2/3 Two Studs, Wing End Black Part 47456 Element 4285883 or 4218569 ×1
  • Hinge Cylinder 1 x 2 Locking with 1 Finger and Axle Hole On Ends [No Side Slots] Black Part 53923 Element 6265699 ×2
  • Minifig Footwear Flipper [Thick] Black Part 10190 Element 6172936 or 6055879 ×2
  • Plate 1 x 1 Black Part 3024 Element 302426 1 spare in the box ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×5
  • Plate 1 x 4 Black Part 3710 Element 371026 ×4
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×3
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×4
  • Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Black Part 60897 Element 6330189 or 4617547 ×4
  • Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×1
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Black Part 60470b Element 6310268 or 4556158 ×1
  • Plate Special 1 x 2 with Handles on Ends Black Part 18649 Element 6099483 ×2
  • Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L Black Part 32828 Element 6196548 1 spare in the box ×1
  • Technic Axle Connector 2 x 3 with Ball Socket, Open Lower Axle Holes Black Part 93571 Element 4610948 ×2
  • Technic Axle and Pin Connector Perpendicular Black Part 6536 Element 6261371 or 4173668 ×6
  • Technic Beam 1 x 2 with Ball Joint Straight, Smooth Ball Black Part 64276 Element 4560108 or 4537514 ×2
  • Technic Brick Special 2 x 2 with Ball Socket Wide and Axle Hole Black Part 92013 Element 4619763 ×4
  • Technic Pin Connector Hub with 2 Perpendicular Axles Black Part 10197 Element 6099801 or 6098801 ×2
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×1
  • Tile 2 x 2 Corner Black Part 14719 Element 6133722 ×1
  • Tile Special 1 x 2 with Handle Black Part 2432 Element 243226 ×1
  • Weapon Sword Hilt with Dragon Head Black Part 36017 Element 6315915 ×1
  • Wedge Plate 2 x 4 Black Part 51739 Element 4531412 ×1

Light Bluish Gray 37 pieces

  • Bar Holder with Hole and Bar Handle Light Bluish Gray Part 23443 Element 6343976 or 6152107 ×1
  • Brick 1 x 3 Light Bluish Gray Part 3622 Element 4211428 ×2
  • Brick Curved Inverted 2 x 1 Light Bluish Gray Part 24201 Element 6144138 ×3
  • Brick Round 2 x 2 Truncated Cone Light Bluish Gray Part 98100 Element 6028324 ×2
  • Brick Round 2 x 2 with Axle Hole Light Bluish Gray Part 3941 Element 4211526 ×1
  • Brick Special 1 x 2 Palisade [aka Log] Light Bluish Gray Part 30136 Element 4550325 or 4519968 ×2
  • Hinge Brick 1 x 2 Locking with 2 Fingers Horizontal End, 7 Teeth Light Bluish Gray Part 54672 Element 6267136 ×2
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×7
  • Plate 2 x 10 Light Bluish Gray Part 3832 Element 4211462 ×1
  • Plate 2 x 4 Light Bluish Gray Part 3020 Element 4211395 ×3
  • Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×3
  • Plate Special 1 x 2 5.9mm Towball Socket Light Bluish Gray Part 14418 Element 6414556 or 6338163 ×1
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Light Bluish Gray Part 60478 Element 4515369 ×2
  • Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Solid Anti-stud] Light Bluish Gray Part 99206 Element 4654577 ×1
  • Plate Special 2 x 4 with Pins Light Bluish Gray Part 30157 Element 4211572 ×2
  • Technic Axle Connector Smooth [with x Hole + Orientation] Light Bluish Gray Part 59443 Element 4512360 ×1
  • Technic Brick 1 x 2 [1 Pin Hole] Light Bluish Gray Part 3700 Element 4211440 ×2
  • Wedge Plate 2 x 2 Cut Corner Light Bluish Gray Part 26601 Element 6186657 ×1

Dark Bluish Gray 23 pieces

  • Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Bluish Gray Part 11477 Element 6029948 ×2
  • Brick Wedged, Sloped 45° 2 x 4 Triple Dark Bluish Gray Part 47759 Element 6027686 ×2
  • Plate 2 x 3 Dark Bluish Gray Part 3021 Element 4211043 ×4
  • Plate Special 1 x 2 with End Towball Dark Bluish Gray Part 22890 Element 6370802 or 6338168 ×2
  • Plate Special 1 x 2, Top Clip [Open O] Dark Bluish Gray Part 44861 Element 6344754 ×3
  • Plate Special 2 x 2 with 1 Pin Hole [Complete Underside Rib] Dark Bluish Gray Part 10247 Element 6047417 ×1
  • Pneumatic Hose Connector with Axle Connector Dark Bluish Gray Part 99021 Element 6265669 or 6020189 ×2
  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×2
  • Technic Beam 1 x 2 with Ball Joint Angled Dark Bluish Gray Part 50923 Element 4503381 or 4289258 ×2
  • Technic Brick 1 x 2 with Hole and Dual Beam Extensions Dark Bluish Gray Part 85943 Element 6324639 or 4547958 ×2
  • Technic Brick Special 2 x 2 with 10.2mm Balls with Holes and Axle Hole Dark Bluish Gray Part 17114 Element 6065816 ×1

Sand Green 23 pieces

  • Brick Sloped 30° 1 x 2 x 2/3 Sand Green Part 85984 Element 6210479 ×2
  • Brick Sloped 65° 2 x 1 x 2 Sand Green Part 60481 Element 6134269 ×4
  • Brick Wedged, Sloped 4 x 4 Pointed Sand Green Part 22391 Element 6586062 or 6256459 ×3
  • Flag 2 x 2 Trapezoid with Flat Area between Clips Sand Green Part 44676 Element 6155255 ×4
  • Tile Special 1 x 1 with Clip with Rounded Edges Sand Green Part 15712 Element 6348059 or 6125669 ×4
  • Tile Special 2 x 3 Pentagonal Sand Green Part 22385 Element 6245273 ×4
  • Wedge Plate 2 x 2 Left Sand Green Part 24299 Element 6247894 ×1
  • Wedge Plate 2 x 2 Right Sand Green Part 24307 Element 6247895 ×1

Pearl Gold 17 pieces

  • Cone 1 x 1 [Top Groove] Pearl Gold Part 59900 Element 4529247 ×1
  • Equipment Disc Amulet Dragon Shape with Opal Trans-Light Blue Flames Pattern Pearl Gold Part 69567pat0002 Element 6337449 ×1
  • Fin Jagged with Axle Hole Pearl Gold Part 76919 Element 6342592 ×2
  • Plate Round 1 x 1 with Open Stud Pearl Gold Part 85861 Element 6190252 or 6141499 1 spare in the box ×1
  • Plate Special 1 x 2 Side Handle [Free Ends] Pearl Gold Part 2540 Element 6279731 ×4
  • Propeller 1 Blade 2 x 16 with Axle Pearl Gold Part 98135 Element 6270129 or 6248488 ×1
  • Tassel with 1 x 1 Round Stud Pearl Gold Part 25375 Element 6274711 or 6251548 ×1
  • Tile Special 1 x 1 with Clip with Rounded Edges Pearl Gold Part 15712 Element 6262138 or 6071259 ×1
  • Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Pearl Gold Part 99563 Element 6207933 or 4651407 ×5

Bright Light Orange 12 pieces

  • Brick Curved 2 x 2 x 2/3 Bright Light Orange Part 15068 Element 6099730 ×4
  • Brick Curved 3 x 1 No Studs Bright Light Orange Part 50950 Element 6022064 ×2
  • Brick Round 3 x 4 x 2/3 Triple Curved with 2 Sunk Studs Bright Light Orange Part 93604 Element 6218142 ×1
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Bright Light Orange Part 54200 Element 6023173 1 spare in the box ×2
  • Plate 1 x 2 Bright Light Orange Part 3023 Element 6028736 or 4645043 ×3

Dark Tan 8 pieces

  • Bracket 1 x 2 - 1 x 2 Inverted Dark Tan Part 99780 Element 6250168 ×4
  • Bracket 1 x 2 - 2 x 2 Dark Tan Part 44728 Element 6275485 ×4

Red 7 pieces

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×5
  • Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin Hole Red Part 66906 Element 6360104 ×2

Trans-Clear 3 pieces

  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Trans-Clear Part 2654 Element 6581772 or 6163901 ×1
  • Tile Round 1 x 1 Trans-Clear Part 98138 Element 6514191 or 6274738 1 spare in the box ×2

Dark Turquoise 2 pieces

  • Minifig Footwear Flipper [Thick] Dark Turquoise Part 10190 Element 6342088 ×2

Flat Silver 2 pieces

  • Flexible Ribbed Hose 8mm Ends 10L Flat Silver Part 27328 Element 6194553 ×1
  • Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] Flat Silver Part 21459 Element 6116593 1 spare in the box ×1

Reddish Brown 2 pieces

  • Panel 1 x 2 x 1 with Rounded Corners and Central Divider Reddish Brown Part 93095 Element 6670645 or 6133860 ×1
  • Plate Special 1 x 4 with 2 Studs with Groove [New Underside] Reddish Brown Part 41740 Element 6257604 ×1

Trans-Light Blue 2 pieces

  • Windscreen with Pearl Gold Frame Mold Trans-Light Blue Part 69564pr0001 ×1
  • Windscreen with Pearl Gold Frame Pattern Trans-Light Blue Part 69564pat0001 Element 6320795 ×1

White 2 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×2

Blue 1 piece

  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×1

Dark Green 1 piece

  • Aircraft Fuselage Curved Aft Section 6 x 10 Bottom Dark Green Part 87616 Element 6340754 ×1

Pearl Titanium 1 piece

  • Weapon Sai Pearl Titanium Part 98139 Element 6270137 or 4646870 1 spare in the box ×1

Tan 1 piece

  • Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Solid Anti-stud] Tan Part 99206 Element 6132769 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 71750-1 [No Color/Any Color] Part 78482 Element 6344849 ×1

Minifigures 2 figures

  • Lloyd - Scuba (Seabound) Minifigure, checked as a whole figure ×1
  • Maaray Guard Minifigure, checked as a whole figure ×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.