Give your heater hose a clean, permanent pass-through instead of pinched doors and sketchy gaps. This 3D-printed heater port lets you route warm air into your camper topper, truck cap, van, or trailer with a low-profile port that actually looks like it belongs there.

Printed from carbon fiber–reinforced filament, it’s lightweight, heat-resistant, and tough enough for real-world use in four-season rigs.

Key features

• Built for diesel & Propex heaters – works with common 3" (75 mm) diesel heater ducts and 60 mm Propex hoses.
• 3.5" hole-saw install – cut a single 3.5" (89mm) diameter hole, drop in the base port, and you’re ready to mount.
• Twist-lock hose adaptor – quick, positive connection to your heater hose so it won’t pull out when you move around camp.
• Inside, outside, or both – mount the adaptor inside your camper, outside on the bed wall, or mirror the setup on both sides for dual-hose builds.
• Low-profile screw cap – seals the port when the heater isn’t in use to keep dust, bugs, and weather out.
• Carbon fiber-reinforced construction – 3D-printed composite makes for a stiff, durable, and heat-tolerant part without adding much weight.

What’s included

• Hose adaptor
• Screw-on cap
• Gaskets
• Base port
• Interior locking ring

Everything you need for a clean, finished heater pass-through – just add your preferred fasteners and sealant to match your wall material.

Specs

• Compatible hose sizes: 75 mm diesel heater ducts, 60 mm Propex heater ducts
• Cut-out size: 3" (76 mm) diameter hole
• Maximum Wall Thickness: .625" (16 mm) with supplied gasket
• Material: carbon fiber–reinforced 3D-printed filament
• Install locations: camper toppers, truck caps, van bodies, enclosed trailers, and other flat wall panels

Ideal for these setups

• Eddy Topper Camper and other camper toppers
• Truck cap campers and canopy builds
• Van conversions and enclosed cargo trailers
• Overland rigs that park the heater outside but want warm air inside

3D-printed notes

Every part is 3D-printed, so you may see light layer lines or small cosmetic imperfections. That’s normal for this process and does not affect strength or function.

These parts are printed using high-temperature ASA Carbon Fiber (ASA-CF) and are designed for normal diesel heater use. For best performance and long part life, we recommend running your heater on low to medium once your camper is up to temperature and avoiding running the heater on high with very short ducting, as this can create higher outlet temperatures at the port.

Steady heat works better than blasting high heat to warm the space up quickly and will provide the best performance and longest service life.

If you need a port for a different hose size, reach out. We can often help with alternate diameters.

See also:
Roam Rest Mattress – another small upgrade that makes camp life easier.

FAQ

Will this work with my diesel heater?
If your heater uses a 75 mm duct (common on many diesel air heaters) or a 60 mm Propex hose, this port will work. Measure your hose before cutting the hole to confirm.

Is this for exhaust or for warm air?
This port is intended for heater ducting only – the warm air going into your camper. Do not route exhaust through 3D-printed parts. Always follow your heater manufacturer’s installation guidelines for safe exhaust routing.

Can I use this on an Eddy Topper Camper?
Yes. It’s a great way to add a clean heater pass-through on an Eddy Topper or any other camper topper. Just choose a wall location with good interior and exterior clearance and follow proper sealing practices.

What about cosmetic defects from 3D printing?
Because these are 3D-printed, small visual blemishes or layer lines are normal. They don’t affect performance or durability.

Can you make different hose sizes?
Other hose sizes are often possible – reach out with your heater and hose dimensions and we’ll let you know what we can do.

What’s the difference between a diesel heater port and a pass-through?

A diesel heater port (also called a pass-through or wall port) is designed to safely route diesel heater intake, exhaust, or ducting through a wall or panel while maintaining a clean, sealed penetration. The primary difference is terminology—functionally, they serve the same purpose. This port is designed to provide a durable, properly sized opening that reduces vibration, abrasion, and exposure at the wall interface.

Can this be used as a diesel heater wall port?

Yes. This product is designed to function as a diesel heater wall port, allowing hoses or ducting to pass cleanly through camper, topper, or enclosure walls. It helps protect the heater components from sharp edges while providing a more finished and secure installation compared to drilling an unprotected hole.

Will this work with a camper topper?

Yes, this diesel heater port is well suited for camper toppers, including aluminum and composite panel designs, provided the wall thickness and mounting surface are compatible with the product dimensions. It is commonly used in truck camper topper builds where space is limited and clean routing is important.

Is this compatible with Propex heaters?

This port is compatible with Propex-style heater installations when the hose or ducting diameter matches the port specifications. Always verify your heater’s hose size and routing requirements before installation to ensure proper fit and airflow.

What materials is the heater port made from?

The port is 3D printed using a durable, heat-resistant material designed for use in vehicle and camper environments. It is intended for controlled heater routing applications and typical diesel heater operating conditions when installed correctly.

Is this product weather-resistant?

When properly installed and sealed, the port can help maintain a weather-resistant barrier at the wall penetration. For best results, use an appropriate sealant compatible with your camper or topper wall material to prevent moisture ingress.

Is professional installation required?

Professional installation is not required. Most users can install the port using basic tools, following standard diesel heater installation practices. Care should be taken to measure accurately, cut cleanly, and seal the penetration properly.