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.

Pneumatics Add-on Set for Machines & Mechanisms

Checking

9641 Pneumatics Add-on Set for Machines & Mechanisms

31 pieces in 17 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

Tubes and Hoses 16 pieces

  • Hose, Pneumatic 4mm D. 12L / 9.6cm Black Part 5102c12 Element 4529099 ×2
  • Hose, Pneumatic 4mm D. 24L / 19.2cm Black Part 5102c24 Element 6437327 or 4529100 1 spare in the box ×1
  • Hose, Pneumatic 4mm D. 40L / 32.0cm Black Part 5102c40 Element 6648026 or 6217915 ×1
  • Hose, Pneumatic 4mm D. 12L / 9.6cm Blue Part 5102c12 Element 4529097 ×3
  • Hose, Pneumatic 4mm D. 24L / 19.2cm Blue Part 5102c24 Element 4529098 1 spare in the box ×1
  • Hose, Pneumatic 4mm D. 6L / 4.8cm Blue Part 5102c06 Element 6503701 or 6449522 ×4
  • Hose, Pneumatic 4mm D. 12L / 9.6cm Light Bluish Gray Part 5102c12 Element 4529103 ×2
  • Hose, Pneumatic 4mm D. 24L / 19.2cm Light Bluish Gray Part 5102c24 Element 6390588 or 4529104 1 spare in the box ×1
  • Hose, Pneumatic 4mm D. 40L / 32.0cm Light Bluish Gray Part 5102c40 Element 6150234 or 4529105 ×1

Pneumatics 15 pieces

  • Pneumatic Switch with Pin Holes Dark Bluish Gray Part 47223a Element 4237158 ×3
  • Pneumatic T-Piece (T Bar) [New Style] Light Bluish Gray Part 4697b Element 4211508 3 spares in the box ×5
  • Pneumatic Pressure Gauge - Manometer (9641) Trans-Clear Part 64065 Element 4529230 ×1
  • Pneumatic Cylinder 1 x 5 with 2 Inlets Trans-Light Blue Part 74981 Element 4529337 ×1
  • Pneumatic Cylinder with 2 Inlets and Rounded End Medium (48mm) Trans-Light Blue Part 47225 Element 6157113 or 4529334 ×2
  • Pneumatic Pump New Style with Black Top Trans-Light Blue Part 2797c02 Element 4529341 ×1
  • Pneumatic Pump Small (5.5L) V2 Trans-Light Blue Part upn0468 ×1
  • Pneumatic Airtank White Part 75974 Element 4529226 ×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.