5pcs RO Water Quick Coupling 3/8" OD to 1/4" Stem Pipe Fittings
5pcs RO Water Quick Coupling 3/8" OD to 1/4" Stem Pipe Fittings
Details
5-Pack RO Water Quick Coupling Straight Pipe Fittings — 3/8" OD × 1/4" Stem
Keep your reverse osmosis system, water dispenser, or aquarium running leak-free with these precision straight quick-coupling fittings. Made from durable POM (Polyoxymethylene) plastic, each connector provides a firm, tool-free push-to-connect hold that seals securely under normal household water pressure. The pack of five means you have spares on hand for future maintenance or multi-point installations.
Key Features
- Universal RO Compatibility: Designed to fit standard reverse osmosis, water purifier, water dispenser, and aquarium filter tubing.
- Straight Quick-Connect Design: Accepts 3/8" OD (9.52 mm) hose on one end and 1/4" stem (6.35 mm) on the other — no tools needed for installation.
- High-Quality POM Construction: Polyoxymethylene plastic resists moisture, corrosion, and wear for long-lasting, reliable performance.
- Rated up to 850 kPa: Handles typical household water system pressure with confidence.
- Female Connection Type: Equal straight shape ensures a clean, secure inline connection.
- 5 Fittings per Pack: Great value — use them for new installs or keep extras for quick replacements.
Specifications
| Material | POM (Polyoxymethylene) Plastic |
| Hose OD (Outer Diameter) | 3/8" (9.52 mm) |
| Stem Diameter | 1/4" (6.35 mm) |
| Inner Diameter | 4 mm |
| Max Pressure | < 850 kPa |
| Connection Type | Female / Push-to-Connect (Straight) |
| Color | White / Blue |
| Quantity | 5 Pieces |
| Country of Origin | Made in China |
Size Conversion Reference
| Metric Code | 01 | 02 | 03 | 04 |
|---|---|---|---|---|
| Inches | 1/8" | 1/4" | 3/8" | 1/2" |
| Tube OD | 3.2 mm | 6.35 mm | 9.52 mm | 12.7 mm |
| Male Thread | 9.7 mm | 13.2 mm | 16.5 mm | 20.5 mm |
| Female Thread | 9.0 mm | 12.2 mm | 15.7 mm | 19.6 mm |
Perfect For
- Reverse osmosis (RO) filtration systems
- Water dispensers and purifiers
- Aquarium filtration and water-change tubing
- DIY plumbing and water treatment projects
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Frequently Asked Questions
Q: What hose sizes are these RO water fittings compatible with?
A: These straight quick-coupling fittings are designed for a 3/8" OD (9.52 mm) hose on one end and a 1/4" (6.35 mm) stem connection on the other. Please refer to the size conversion table above to match your existing tubing before purchasing.
Q: What material are these pipe fittings made from, and are they safe for drinking water systems?
A: The fittings are made from POM (Polyoxymethylene), a food-grade-grade engineering plastic widely used in water filtration and dispensing applications for its durability, moisture resistance, and low reactivity. They are suitable for use in RO drinking water systems and aquarium setups.
Q: How do I install these quick-coupling fittings?
A: Simply push your tubing firmly into the fitting until it clicks or seats securely — no tools required. To remove, press the release collar (if present) and pull the tube out. Ensure your water pressure does not exceed 850 kPa for a leak-free connection.
Q: How many fittings come in a pack?
A: Each order includes 5 straight quick-coupling RO water pipe fittings, giving you enough for a full installation or replacement plus extras for future use.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.
Materials + Care
We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.
Shipping + Returns
We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.