Quick answer: This is a genuine ResMed single-limb breathing circuit (smooth bore, 15 mm) with a water trap for the Astral ventilator (part 21314). A breathing circuit is the tubing that carries air between the ventilator and the patient. This is the single-limb configuration in the 15 mm (paediatric) bore, with a smooth interior and an integrated water trap — which collects condensation and makes this circuit suitable for use with humidification. Set up and use as directed by the patient's clinical team.
About this circuit
Breathing (ventilator) circuits connect the Astral ventilator to the patient interface. The Astral supports single- and double-limb circuits using interchangeable circuit adapters. In a single-limb circuit, one tube carries air to the patient, with exhalation managed by a valve or vent in the setup. This circuit has a smooth bore (smooth inner wall) for low resistance to airflow, is the 15 mm diameter (typically for paediatric patients), and includes a water trap — a small reservoir that collects condensation ("rainout") from humidified air so it doesn't pool in the tubing. This makes it the circuit used when humidification is part of the therapy. Because the Astral requires a "learn circuit" procedure when the circuit type changes, follow the clinical team's setup instructions.
Key features
- Genuine ResMed single-limb circuit (21314) — for the Astral ventilator.
- Smooth bore — smooth interior wall for low resistance.
- 15 mm diameter — paediatric size.
- Integrated water trap — collects condensation; suitable for humidified therapy.
- Connects via circuit adapter — fits the Astral with the appropriate adapter.
- Clinician-directed use — set up per the Astral clinical guide.
Specifications
| Specification | Detail |
| Product type | Ventilator breathing circuit (single limb) |
| Bore | Smooth bore |
| Diameter | 15 mm |
| Configuration | Single limb, with water trap (for humidification) |
| Water trap | Included |
| Typical use | Paediatric patients |
| Compatible ventilator | ResMed Astral (via circuit adapter) |
| ResMed reference / SKU | 21314 |
| Prescription | Required — clinician-directed |
| Brand | ResMed |
Is it right for my setup?
Breathing circuits come in different types, diameters (10, 15, or 22 mm), and configurations (single vs double limb), corrugated or smooth bore, with or without water traps. The right circuit depends on the patient and the prescribed ventilation setup — your clinical team will advise which circuit to use and how to assemble it. This 15 mm smooth-bore single-limb circuit with a water trap is intended for paediatric patients and for use with humidification. The Astral requires a "learn circuit" step whenever the circuit type is changed. If you're unsure whether this circuit matches your prescription, confirm with your provider before ordering.
Frequently asked questions
What is a single-limb circuit? It uses one tube to carry air to the patient, with exhalation managed by a valve or vent in the setup — as opposed to a double-limb circuit with a separate expiratory limb.
What does "smooth bore" mean? The inner wall of the tubing is smooth (rather than corrugated), which offers low resistance to airflow.
What does the water trap do (and why "for humidification")? The water trap collects condensation from humidified air so it doesn't pool in the tubing — which is why this is the circuit used when humidification is part of the setup.
Who is the 15 mm size for? The 15 mm bore is typically used for paediatric patients. Your clinical team confirms the correct circuit.
Which ventilator does it fit? The ResMed Astral, using the appropriate circuit adapter.
Do I need a prescription? Yes — ventilator circuits are used under clinical direction. Confirm your prescribed setup with your provider.
Can I get it delivered in Brooklyn or shipped nationwide? Yes — Task Supply Corp offers USPS shipping throughout the continental U.S., plus local pickup and delivery in Brooklyn and all five boroughs of New York City.
This is a prescription medical device accessory for use under clinical direction. Follow the Astral clinical/user guide and your healthcare team's instructions, including the required "learn circuit" procedure.