Bridge the Gap Between Air and Motion

Unlock the power of pneumatics in your LEGO® Technic creations with this essential connector piece. This versatile part is ingeniously designed to connect a flexible pneumatic hose to a standard Technic axle. It serves as the crucial link that allows you to translate air pressure from your pneumatic system into powerful rotational force, bringing your complex machinery to life.

This connector is a cornerstone of advanced Technic building, indispensable for creating functional models like robotic arms, powerful cranes, vehicle steering systems, and any other invention that relies on air-powered mechanics. Its robust design ensures a secure and leak-free connection, even under pressure.

Product Details

• Part ID: 99021
• Function: Connects a pneumatic hose (4mm D.) to a Technic axle.
• Key Feature: Translates pneumatic power into mechanical rotation.
• Color Options: Available in a variety of colors to match your build's aesthetic.
• Theme: LEGO® Technic

Builder's Inspiration

Use this connector as the heart of your pneumatic functions. Pair it with cylinders, pumps, and switches to build complex, automated systems. It's the key to making your models not just look realistic, but function realistically too.

Complete Your System

• Find everything you need for your project in our LEGO® Pneumatic Parts collection.
• Explore a universe of functional pieces in the LEGO® Technic Pieces collection.
• Secure your build with parts from our Technic Pins and Connectors assortment.

LEGO® parts are intended for builders aged 4 and up. They may pose a choking hazard for children under 3 years old.