# Check valve ZOLUX transparent — ZOLUX model 12012, inline non-return valve for aquarium tubing

**URL:** https://aio.lv/en/product--zolux-12012--12038524
**Data updated:** 2026-03-12 16:47 (EET)
**Category:** Aquarium Supplies
**Manufacturer:** ZOLUX
**Manufacturer code:** 12012
**EAN:** 3336023346038
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 4.99 €
**Prices and availability valid until:** 2026-07-17 23:59
**Price without VAT (21%):** 4.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--zolux-12012--12038524

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

Transparent check valve ZOLUX model 12012 is an inline non-return valve designed for aquarium and aquatic system tubing. The transparent body allows visual inspection of flow direction and blockages. It prevents backflow in air and water lines, protecting pumps and equipment. Suitable for use in filtration, aeration and CO2 setups where one-way flow is required.

## Long description

Transparent check valve ZOLUX model 12012 is an inline non-return valve designed for aquarium and aquatic system tubing. The clear plastic body provides visual confirmation of flow direction and makes it easy to spot blockages or trapped air. It prevents backflow in air and water lines, protecting pumps, reactors and other equipment from reverse flow and accidental siphoning. The valve is compatible with standard aquarium tubing and can be installed unobtrusively in filtration, aeration or CO2 systems where one-way flow is required.
Advantages
The transparent construction enables quick visual inspection without disassembly, reducing maintenance time. The inline design simplifies installation in existing tubing runs and minimizes the number of connectors required. Its one-way mechanism reliably prevents reverse flow, helping to protect pumps and downstream devices. The valve’s compact size and smooth internal pathway reduce turbulence and flow resistance.
Suitable for
Aquarium air pump lines and airstones
CO2 delivery systems for planted tanks
External filters, reactors and return lines
Siphon protection during water changes and maintenance
Key specifications
Inline non-return (one-way) valve for aquarium tubing
Transparent plastic body for visual flow inspection
Suitable for air and water applications
Compact, low-profile inline design
Compatible with standard flexible aquarium tubing diameters
How to use
Cut the aquarium tubing at the chosen installation point and insert each tube end into the corresponding inlet and outlet ports of the check valve, ensuring the flow direction marking on the valve matches the intended flow. Push tubing fully onto the connectors to form a secure fit; if necessary, use hose clips for extra assurance. Position the valve so the transparent body is visible for periodic inspection. For CO2 or air lines, check for tight seals to avoid gas leaks; for water lines, verify there is no leakage under operating pressure.
Usage recommendations
Inspect the transparent valve regularly for debris, blockages or trapped air. Replace the valve if the mechanism shows wear or if leaks occur. Avoid exposing the valve to aggressive chemicals or temperatures outside normal aquarium ranges to preserve material integrity.

## FAQ

### How much does the ZOLUX check valve 12012 transparent cost, and is it available for purchase?

The price is 4.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 70 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 07.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All ZOLUX products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized ZOLUX service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12038524/67525785_large.webp