--- product_id: 37842833 title: "Aquarium Check Valves Plastic One Way Non-Return Check Valve for Fish Tank" brand: "pawfly" price: "€ 8.67" currency: EUR in_stock: true reviews_count: 13 category: "Pawfly" url: https://www.desertcart.pt/products/37842833-aquarium-check-valves-plastic-one-way-non-return-check-valve store_origin: PT region: Portugal --- # 0.12" air hole diameter for smooth airflow 1-way check valve prevents backflow 0.1 oz ultra-lightweight design Aquarium Check Valves Plastic One Way Non-Return Check Valve for Fish Tank **Brand:** pawfly **Price:** € 8.67 **Availability:** ✅ In Stock ## Summary > 🐠 Keep your aquarium breathing easy with the CV6R — the silent guardian of your oxygen flow! ## Quick Answers - **What is this?** Aquarium Check Valves Plastic One Way Non-Return Check Valve for Fish Tank by pawfly - **How much does it cost?** € 8.67 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/37842833-aquarium-check-valves-plastic-one-way-non-return-check-valve) ## Best For - pawfly enthusiasts ## Why This Product - Trusted pawfly brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless Maintenance:** Simple cleaning with a slim stick keeps your valve clog-free and performing at peak. - • **Featherlight Efficiency:** At just 0.1 oz, it adds zero bulk—keeping your setup sleek and hassle-free. - • **Whisper-Quiet Durability:** Crafted from sturdy plastic for long-lasting, noiseless operation—because your tank deserves peace. - • **Seamless Airflow Assurance:** Precision 0.12" air holes ensure uninterrupted oxygen delivery to your aquatic friends. - • **Backflow Blocker Extraordinaire:** One-way valve design protects pumps by stopping water backflow during outages. ## Overview The CV6R is a compact, lightweight one-way check valve designed specifically for aquarium oxygen pumps. With a 0.12" air hole diameter and durable plastic construction, it prevents water backflow during power outages or pump pauses, ensuring consistent aeration. Its quiet operation and easy maintenance make it an essential, reliable accessory for any professional or enthusiast fish tank setup. ## Description Aquarium Air Pump Check Valves Red/Clear Clear Plastic One Way Non-Return Check Valve for Fish Tank Review: Great quality check valves - Great quality check valves for a really reasonable price. Not much to these. Worked great for fixing my Keurig 2.0 K200 coffee maker which had a damaged air pump (very common problem I learned). Replaced the air pump and tested operation. Worked great but noticed water was being pushed into it, which is what caused it to fail the first time. Added one of these check valves in line and life is great now. Shame on Keurig for planned obsolescence. Review: Just like describe - They work just fine ## Features - For Oxygen Pumps Only: Great 1-way check valve for most common aquarium air pumps. NOT suitable for CO2 or other high-pressure systems to avoid crack and leak. - Small & Light: Size: 2.1" L x 0.55" W; Diameter of air holes: 0.12"; Weight: 0.1 oz. Standard ID airline tubing: 3/16". Add little weight to your hose for smooth airflow. - Ideal Pump Protectors: Prevent backflow of water through the tubing during a power outage or pump pause. Essential accessories for basic aeration setup in your fish tanks. - Sturdy & Quiet: Made of reliable plastic which can be tightly connected to the hose without air leak. The check valve can endure long-time use without making noise. - Easy Maintenance: Clean the valve regularly. Please poke it with a slim stick from the inlet side to push it open when it gets clogged inside and restricts air flow. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01N92AXHF | | Best Sellers Rank | #7,624 in Pet Supplies ( See Top 100 in Pet Supplies ) #5 in Aquarium Air Pump Accessories | | Brand Name | Pawfly | | Connector Type | Compression | | Customer Reviews | 4.5 4.5 out of 5 stars (5,453) | | Exterior Finish | Plastic | | Inlet Connection Type | Compression | | Item Dimensions | 2.13 x 0.83 x 0.83 inches | | Item Weight | 10 Grams | | Manufacturer | Pawfly | | Material Type | Plastic | | Model Number | PF-Ap | | Number of Pieces | 6 | | Number of Ports | 2 | | Outlet Connection Type | Compression | | Size | 6 Pack | | Thread Size | 3/16 inch | | Thread Type | Compression | | UPC | 712383629098 712383629555 | | Unit Count | 6.0 Count | | Valve Type | Check Valve | ## Product Details - **Brand:** Pawfly - **Exterior Finish:** Plastic - **Inlet Connection Type:** Compression - **Item dimensions L x W x H:** 2.13 x 0.83 x 0.83 inches - **Manufacturer:** Pawfly - **Material:** Plastic - **Number of Ports:** 2 - **Outlet Connection Type:** Compression - **UPC:** 712383629098 712383629555 ## Images ![Aquarium Check Valves Plastic One Way Non-Return Check Valve for Fish Tank - Image 1](https://m.media-amazon.com/images/I/6129zPI7nfL.jpg) ## Available Options This product comes in different **Pattern, Color** options. ## Questions & Answers **Q: Are these ball and spring?** A: That is not part of the description and no such assembly is visible. You would have to ask Pawfly. **Q: does anyone know the maximum flow rate on these check valves?** A: NO ! But they work Great **Q: What size hose are these made for?** A: Standard aquarium hose 3/16" ID hose will fit. Used it with PENN PLAX Standard Airline Tubing without any problems **Q: What type of plastic is it made of** A: It's a hard clear good quality plastic. Successful at backflow prevention ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great quality check valves *by B***V on January 2, 2026* Great quality check valves for a really reasonable price. Not much to these. Worked great for fixing my Keurig 2.0 K200 coffee maker which had a damaged air pump (very common problem I learned). Replaced the air pump and tested operation. Worked great but noticed water was being pushed into it, which is what caused it to fail the first time. Added one of these check valves in line and life is great now. Shame on Keurig for planned obsolescence. ### ⭐⭐⭐⭐⭐ Just like describe *by A***R on March 1, 2026* They work just fine ### ⭐⭐⭐⭐ Works effectively but the hoses slip off over time. *by B***H on July 13, 2025* The airflow control works just fine but due to the smooth tapered connectors, the hoses constantly slide off. I had to superglue the hose onto it ## Frequently Bought Together - Pawfly Aquarium Check Valves Plastic One Way Non-Return Check Valve for Fish Tank - Penn-Plax Standard Airline Tubing for Aquariums – Clear and Flexible – Resists Kinking – Safe for Freshwater and Saltwater Fish Tanks – 25 Feet - Pawfly Aquarium Air Stone 1 Inch, Fish Tank Air Stone Aerator Bubble Diffuser for Nano Air Pumps Small Buckets and Fish Tanks, 10 Pack --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/37842833-aquarium-check-valves-plastic-one-way-non-return-check-valve](https://www.desertcart.pt/products/37842833-aquarium-check-valves-plastic-one-way-non-return-check-valve) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-04-23*