D-size medical oxygen cylinder
| Specially designed for hospital wards, EMS teams, clinics and elderly care institutions
Provide reliable and lightweight medical oxygen storage solutions for hospital emergency departments, ICUs, general wards, clinics, EMS teams and elderly care institutions. Solve the problems you face in scenarios such as central oxygen system backup, pre-hospital emergency rescue and inter-department patient transfer where continuous oxygen access is critical. Holding ISO 7866 and DOT-3AL international certifications, it supports bulk purchasing and OEM customization of cylinder colors, institutional logos, valve configurations and packaging.
Safety and Compliance
Each gas cylinder undergoes 100% water pressure testing, ultrasonic flaw detection and air tightness testing, and is accompanied by a traceable third-party certification report to ensure absolute safety.
Lightweight design
Compared with traditional gas cylinders, the weight is reduced by 30% to 40%, significantly lowering logistics costs and the operational load on workers.
Deep customization service
Supports OEM/ODM based on your filling gas, production line interface, and brand logo, including all-round customization in color, valves, size and packaging.
One-stop support
We offer full-cycle services ranging from technical selection consultation, compliance guidance to after-sales maintenance. Our professional engineering team is your strong backing.

| Drawing No. | Outside Diameter | Water Capacity | Length | Weight | Service Pressure | Test Pressure | Specification | ||||
| mm | in | liters | lbs | mm | in | kgs | lbs | bar/psi | bar/psi | ||
| MS-111-232-H-01 (2.73~5.07)L |
111 | 4.37 | 2.73 | 6.02 | 420 | 16.5 | 2.5 | 5.5 | 139/2015 | 232/3364 | DOT-3AL |
| 3.9 | 8.6 | 570 | 22.4 | 3.3 | 7.3 | ||||||
| 5.07 | 11.18 | 720 | 28.3 | 4 | 8.8 | ||||||
Material: High-quality aluminum alloy 6061-T6
Stamp markings: According to standards, additional markings are available upon request;
Surface treatment: brushed body with clear powder coating and green neck;
Threads: M25x2, 3/4-16UNF-2B, 25E, other threads available on request;
Valve: CGA 870
Other Customization Options: Logos, Graphics, Packaging, Accessories (Nasal Cannula, Mini Oxygen Regulators);
OEM/ODM customization capability - integrating products into your brand and system
Our customized services cover four major dimensions
• Customized specifications: Volume, diameter, height, valve opening type - within the safety standard range, adjust as needed
• Customized appearance: Bottle body color, shoulder color matching, enterprise LOGO, product label - Let the gas cylinder become your mobile billboard
• Customized identification: Laser engraving, screen printing, permanent coding - achieving full life cycle traceability management
• Customized packaging: Exclusive packaging solutions, pallet specifications, and shipping mark designs - tailored to your warehousing and logistics systems
From sample confirmation to batch delivery, we offer one-on-one dedicated account manager coordination to ensure that every customized detail is precisely implemented.



Three major application scenarios for D-size medical oxygen cylinder
Scene One: Hospital Ward Bedside Emergency Backup
In general hospital wards, observation rooms and nursing units, traditional heavy steel oxygen cylinders occupy large floor space and require two-person labor for handling and replacement, greatly increasing daily nursing workload. During central oxygen pipeline maintenance, failure or pressure fluctuation, inpatients face the risk of sudden oxygen suspension. Midstar D-size aluminum oxygen cylinder adopts aviation-grade lightweight alloy design, far lighter than steel cylinders and available for single-person rapid deployment. It can be widely arranged as standardized bedside backup oxygen source, building a dual safety guarantee of "central pipeline supply + portable standby supply". Unified industrial specifications simplify cross-department inventory counting, asset management and batch replacement, while anti-misoperation valve structure ensures stable and safe use in high-frequency ward environments.
Scene Two: EMS Rescue & In-hospital Mobile Patient Transfer
Ambulance first aid, pre-hospital rescue and inter-department patient transfer require continuous and stable mobile oxygen support. Traditional steel cylinders are ferromagnetic and overweight, which increase vehicle load and cannot enter MRI imaging rooms, resulting in delayed examination and treatment for oxygen-dependent patients. Midstar D-size medical oxygen cylinder features non-magnetic aluminum alloy material with no equipment interference and no imaging distortion, fully compatible with MRI examination scenarios. Compact and portable structure perfectly fits ambulance vehicle layout and mobile medical needs. Standard supporting interfaces shorten rescue preparation time, effectively avoid oxygen interruption during patient transfer, and ensure full-link oxygen safety for emergency medical teams.
Scene Three: Institutional Home Care & Medical Rental Fleet Operation
Professional rehabilitation centers, large-scale elderly care institutions and medical equipment leasing companies require a large number of standardized medium-capacity oxygen cylinders for long-term home rehabilitation oxygen therapy and institutional reserve. Traditional cylinders are heavy, difficult to deliver and recycle in batches, while ordinary civilian oxygen tanks lack formal medical certification and cannot meet institutional service standards. Midstar D-size medical oxygen cylinder features medical-grade certification, stable performance and simple operation, perfectly suitable for batch deployment of B-end medical service fleets. It supports customized institutional logos, unified color coding and batch marking, helping medical operators realize unified asset management, batch scheduling and standardized large-scale commercial operation.


Full-process support from concept to mass production: From drawing review, prototype making to mass production and quality inspection, we offer one-stop services, significantly shortening your product launch cycle.
Flexible cooperation based on demand: Whether it's a small-batch trial order or a long-term large-scale framework purchase, we can offer competitive tiered pricing and stable inventory planning.
Cross-industry application expert: Our gas cylinder solutions have been successfully applied in fire-fighting equipment, medical devices, diving equipment and the beverage industry. We are glad to apply our cross-industry experience to solve your specific challenges.

Regarding packaging
In order to deliver our products to you in the condition in which they were sent, we use strict, strong, efficient and environmentally friendly packaging methods.
Our standard packaging method for our products is to cover them with plastic bags, put them into cartons, then place the cartons on pallets and wrap them tightly with stretch film to ensure that the cylinders do not collide with each other during transportation. Other packaging methods can be provided upon request.

Certification system of Midstar
• U.S. market: DOT-3AL (U.S. Department of Transportation Standard for Aluminum Alloy Gas Cylinders)
• EU market: TPED /EU + PED /EU (Dual Directive compliance)
• International standard: ISO 7866 (Global Technical Benchmark for Gas Cylinder Industry)
• UK market: BS 5045-8 (UK National Standard)
• Chinese market: GB/T 11640 (National Recommended Standard of China)
All certifications are reviewed and issued by international authoritative institutions to ensure the authenticity and traceability of compliance documents.


Professional service commitment
We offer comprehensive support, not just products.
Bulk purchasing plan: Based on your annual purchasing volume, we offer tiered preferential prices and flexible delivery plans.
Customized services: Supports institutional customization of gas cylinder colors and markings, facilitating asset identification and management.
Training and Guidance: Provide training on product usage and safety regulations for your team.
After-sales service and Inspection: We offer regular safety inspection services for gas cylinders or assist in contacting qualified local inspection institutions.

Call to action
To the Procurement Managers of Institutions, if you are evaluating or updating equipment, we can provide you with:
Free sample experience: Test the lightness and reliability of the product in person.
Contact our B2B sales team immediately to get a personalized quotation and solution.
FAQs
Q: How to ensure the products' quality?
A: Samples will be sent to you for test firstly, the product quality will be test and show you before delivery.
Q: Can I book an order if less than MOQ?
A: Yes. Please tell us your quantity, we will work out the cost for you.
Q: Where is your market ?
A: Our products are popular in the United States, Mexico, the United Kingdom, Russia, Canada, Brazil, the Middle East, and Southeast Asia. and more than 50 countries and regions all over the world.
Q: How about the production capacity?
A: We have strong production capacity. It is more than 10,0000pcs per month.












