Getting
Started with
Pneumatics
for Halloween
Props

Pneumatics uses compressed air to push a piston rod in and out of a cylinder. You control the direction with a solenoid valve — an electrically-operated air switch. Open the valve one way, the rod extends; switch it the other way, the rod retracts. That push-pull action is what drives prop movements: a popping skull, a snapping jaw, a lunging torso, a rising arm.

The core system: air source → regulator that drops the pressure to a safe working level and removes moisture → solenoid valve that directs air in or out → the cylinder attached to whatever you're animating.

Both Starter Kits include everything except the cylinder and the air source. Specifically:

• Regulator with Water Trap — reduces incoming pressure to a safe working level and separates moisture from the air stream.
• 5-Way Solenoid Valve — the electric valve that sends air into one end of the cylinder or the other. Runs on 12V DC.
• 2× Speed Controllers — in-line restrictors that let you dial the movement speed up or down.
• Meanwell RSP-75-12 Power Supply — a quality 12V DC supply to power the solenoid.
• Air Tubing Kit — push-fit polyurethane tube and a selection of push-fit fittings to connect everything.

Not included: the cylinder (choose from our range separately), an air source, and the hose or fittings to connect that air source to the regulator input.

The number refers to the push-fit tubing diameter. Larger tubing flows more air, which matters when you need fast or powerful movements.

6mm kit — for 16mm and 25mm bore cylinders. The most popular choice for Halloween builds. Suits jaws, skull pops, arm raises, head movements, and most mid-sized props.

8mm kit — for 32mm bore cylinders, or when you need faster action or more force. Heavy lunging props, large sweeping movements, hard-hitting jump scares.

The 5-way solenoid valve is the air circuit's switch. When 12V is applied, it directs pressurised air into one end of the cylinder (rod extends). When the power is cut, a spring returns it to the default position and air goes into the other end (rod retracts).

"5-way" means five ports: supply in, two to the cylinder, and two exhaust ports for spent air to escape. Each on/off cycle = one full extend-and-retract of the prop.

Trigger it from any controller that can switch a 12V DC load — relay boards such as the ILightThat BaldrickSwitchy, or a simple push button for testing.

Speed controllers are adjustable in-line restrictors. Without them, cylinders fire at full speed — often fast enough to look mechanical rather than prop-like. Adding a speed controller lets you slow the motion down to something more convincing.

Each kit includes two — one for extend, one for retract — so you can tune how fast the prop lunges and how fast it resets independently. Turn the adjuster screw to open or restrict the flow.

Compressors produce air at high pressure — typically 6–10 bar. Running cylinders at full compressor pressure would be too fast, waste air, and risk seal damage. The regulator lets you dial in a lower, consistent working pressure regardless of what's coming from the supply side.

The water trap catches moisture that condenses in compressor tanks and hoses. Without it, water gets into cylinders and valves over time and causes corrosion and seal damage. Drain the bowl occasionally if you run a compressor regularly.

The included brass fittings and pressure gauge connect directly to the regulator body. You supply the hose that connects your air source to the regulator's input port — see section 04 for details.

The Meanwell RSP-75-12 is a quality enclosed 12V DC switching supply rated at 75W (just over 6A). It powers the solenoid valve and has plenty of headroom to run multiple solenoids if you expand your setup later.

It connects to 230V mains and outputs 12V DC through screw terminals. Meanwell are trusted in the industry and these units run reliably over long display seasons.

The first number is the bore diameter — the internal width of the cylinder in millimetres. This determines force output. Wider bore = more surface area for air to push against = more force. We stock 16mm, 25mm, and 32mm bores.

The second number is the stroke length — how far the rod travels when it extends, in millimetres. A 150mm stroke is roughly 6 inches of movement. Strokes range from 50mm to 500mm across the range.

16mm — lightest, uses the least air, very snappy. Good for fingers, jaws, eye poppers, small head movements, lightweight props under 2–3kg of load.

25mm — the sweet spot for most Halloween builds. Meaningfully more force than 16mm but still air-efficient. Good for skull pops, torso lurches, arm raises, props up to around 5–8kg.

32mm — strong and fast. For heavy props, large sweeping movements, or hard-hitting jump scares. Uses significantly more air per cycle. Needs the 8mm kit.

Choose the shortest stroke that achieves your effect — longer strokes use more air, move more slowly at the same pressure, and take up more room inside your prop structure.

As a rough guide: jaw snap = 50–100mm. Head tilt or skull pop = 100–150mm. Arm raise or torso lurch = 200–300mm. Full body lunge = 300–500mm. Mock up the movement before ordering.

You can use a speed controller and the prop's own mechanical stops to limit actual travel even if the cylinder has a longer stroke than strictly needed.

We sell two mounting types for each bore size (16mm, 25mm, 32mm):

Top Mount — clamps onto the rear of the cylinder body and lets you bolt it flat against a structure. Good for inline push-pull applications where the rod travels in a straight line.

Saddle Mount — wraps around the barrel and allows a small amount of pivot. Essential when the rod end needs to swing in an arc as the prop rotates — which is most builds. Most props need at least one saddle mount to absorb angular movement without stressing the cylinder body.

The kits cover everything from the regulator output onwards. The connection from your air source to the regulator input is something you supply yourself, since it depends on your source type:

BSP push-fit adaptors are available from any pneumatics supplier — RS Components, Screwfix, Toolstation. For the tyre method, search "Schrader valve to airline adaptor."

For most Halloween prop applications, 2–4 bar gauge (30–60 psi) is the practical sweet spot. Cylinders move with good authority, seal life is long, and air consumption stays manageable.

Lower pressure (1–2 bar) gives smoother, slower movement — atmospheric and creeping. Higher pressure (4–6 bar) gives snappier action — jump scares and fast pops. Use the speed controllers to fine-tune movement after setting the pressure.

For the tyre method, you're limited by tyre pressure (2.5–3 bar max). Set the regulator at least 0.5 bar below the pressure you're willing to let the tyre drop to before refilling.

Add up the air consumed per minute across all your cylinders and compare to what your source can supply.

Tyre sizing: Two 25×150mm cylinders each firing 10 times per minute at 4 bar use roughly 2 × 0.73L × 10 = 14.6 L/min. A car tyre holds ~48L usable at 3 bar, so about 3 minutes of continuous running. Keep a spare pre-inflated tyre for a hot-swap.

Compressor sizing: Most small hobby compressors deliver 100–200 L/min free air. A few 16mm or 25mm cylinders firing a handful of times per minute is well within a compact 6-litre unit. Multiple 32mm cylinders firing rapidly will benefit from a larger tank and higher-flow pump.

Compressed air deserves respect. At Halloween prop working pressures (2–6 bar), it can cause serious injury if fittings fail, are directed at a person, or if a pressurised vessel is damaged. The hobby prop community does this safely every year — the key is following good practice consistently.

Always: use the regulator. Depressurise the system before working on any fittings. Ensure all push-fit connections are fully home — pushed in until the tube can't be pulled out without pressing the release collar. Keep the work area clear during testing and setup.

• Conceal pressurised parts: Keep compressors, tanks, tyres, and hose runs behind barriers or out of reach of guests.
• Prop containment: Ensure moving cylinder rods cannot contact a person. Use guards or position props so movement is directed away from the audience path.
• Exhaust noise: Cylinders exhaust air with a sharp hiss on each cycle. Consider whether very young children or pets nearby could be distressed by sudden activations.
• Tyre storage: If using tyres as reservoirs, keep them in a closed space not accessible to guests.

Yes — and this is one of the most satisfying integrations. The solenoid valve runs on 12V DC and draws under 500mA. Any controller that can switch a 12V DC load can drive it directly — The iLightThat BaldrickSwitchy is perfect, and the upcoming BaldrickScene will be even better.

For sequenced Halloween displays, many builders sync pneumatic props to music via xLights — the cylinder just becomes another channel in the show file.

Yes. Each Starter Kit includes one solenoid valve, which drives one cylinder. For additional cylinders, add more solenoid valves from our range. All solenoids share the same regulator and air supply, connected using the Y-splitters and push-fit fittings we stock.

The Meanwell 12V supply at 75W has headroom to run several solenoids simultaneously. Daisy-chain the 12V across all the valves you're running.

Every additional cylinder adds to your total air consumption. Use the table in section 06 to confirm your air source can handle everything running at once.