# Check valve FERRO ZZK5 PN16 6/4" for water systems

**URL:** https://aio.lv/en/product--ferro-zzk5--11835985
**Data updated:** 2026-03-09 14:49 (EET)
**Category:** Kitchen & Bathroom Faucets
**Manufacturer:** FERRO
**Manufacturer code:** ZZK5
**EAN:** 5901095644108
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 32.99 €
**Prices and availability valid until:** 2026-07-10 23:59
**Price without VAT (21%):** 27.26 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ferro-zzk5--11835985

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 02.07.2026 | free |
| Pickup points | 07.07.2026 | 1.99 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

FERRO ZZK5 is a PN16-rated check valve (non-return valve) with a 6/4" connection size designed for use in water and heating installations. The valve prevents backflow, ensures unidirectional fluid flow and is suitable for pipelines with nominal pressure up to PN16. Typical applications include residential and commercial water supply, central heating circuits and pump protection.

## Long description

FERRO ZZK5 PN16 6/4" check valve is designed for water and heating systems where prevention of backflow and secure unidirectional flow are required. Constructed for PN16 nominal pressure, this non-return valve fits 6/4" pipe connections and is suitable for residential and commercial water supply, central heating circuits and pump protection. The design focuses on reliable sealing and stable operation within specified pressure and temperature ranges used in typical domestic and light commercial installations.
Advantages
The check valve provides dependable prevention of reverse flow and protects pumps and system components from hydraulic shocks caused by backflow. Its PN16 rating ensures compatibility with pipelines rated for nominal pressure up to 16 bar. The 6/4" connection size offers a commonly used interface for retrofit and new installations. The valve is designed for straightforward installation and low maintenance, delivering consistent performance in water and heating applications.
Suitable for
 Residential cold and hot water supply lines
 Central heating circuits and radiators
 Pump discharge lines for backflow protection
 Commercial water distribution systems with PN16 rating
Key specifications
 Connection size: 6/4" (compatible with corresponding fittings)
 Nominal pressure rating: PN16 (suitable up to 16 bar operating pressure)
 Media: water (cold and hot) for heating and potable applications where materials are appropriate
 Function: non-return (check) valve to prevent reverse flow
 Typical installation orientation: inline, with flow direction indicated on body
How to use
Install the check valve inline in the pipeline following the flow direction arrow marked on the valve body. Ensure pipe threads or fittings for the 6/4" connection are clean and properly sealed with suitable thread sealant or tape. Tighten connections to the recommended torque for the pipe material to avoid leaks or damage. Verify the system is depressurized before installation or maintenance. After installation, slowly pressurize the system and inspect joints for tightness and correct operation of the non-return function.
Usage recommendations
Use the FERRO ZZK5 PN16 6/4" check valve in applications within the PN16 pressure class and for water media. Avoid installation where aggressive chemicals or media outside of water are present unless material compatibility is confirmed. For long-term reliability, perform periodic visual inspections and check for signs of leakage or sticking; replace the valve if internal parts show wear or if the non-return action is impaired.

## FAQ

### How much does the Check valve FERRO ZZK5 PN16 6/4" cost, and is it available for purchase?

The price is 32.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 13 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 02.07.2026 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 FERRO 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 FERRO 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/11835985/67235696_large.webp