# Check Valve FERRO ZZK4 PN16 5/4"

**URL:** https://aio.lv/en/product--ferro-zzk4--11835819
**Data updated:** 2026-03-09 14:49 (EET)
**Category:** Kitchen & Bathroom Faucets
**Manufacturer:** FERRO
**Manufacturer code:** ZZK4
**EAN:** 5901095644115
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 25.49 €
**Prices and availability valid until:** 2026-07-22 23:59
**Price without VAT (21%):** 21.07 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ferro-zzk4--11835819

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

FERRO ZZK4 is a check (non-return) valve designed for PN16 pressure systems with a 5/4" (1¼") connection. The valve prevents backflow in pipelines, suitable for water and heating installations where PN16 rating is required. Typical uses include central heating, domestic water systems and circulation lines requiring automatic flow isolation.

## Long description

FERRO ZZK4 PN16 5/4" is a check (non-return) valve intended for use in PN16 pressure systems with a 1¼" connection. The valve is designed to prevent reverse flow in pipelines and is suitable for water and heating installations where PN16 rating is required. Typical applications include central heating circuits, domestic hot and cold water systems, and circulation lines that need automatic isolation of backflow.
Advantages
The valve provides reliable non-return action with a PN16 pressure rating, ensuring protection against backflow in residential and light-commercial installations. Its 1¼" connection size fits common piping used in heating and water systems. Constructed for compatibility with water and heating media, the design supports straightforward integration into existing pipelines and circulation circuits. The compact form factor simplifies installation in confined spaces while maintaining operational stability.
Suitable for
Central heating systems
Domestic hot and cold water installations
Circulation and return lines in hydronic systems
Systems requiring PN16-rated non-return protection
Key specifications
Pressure rating: PN16
Connection size: 5/4" (1¼") threaded connection
Function: check (non-return) valve to prevent backflow
Intended media: water and heating fluids compatible with PN16 valves
Typical installation: inline mounting within pipework
How to use
Install the FERRO ZZK4 in the pipeline following the system flow direction marked on the body to ensure correct non-return operation. Use appropriate thread sealing material or tape on the threaded connections to provide a pressure-tight joint. Tighten connections with suitable tools without over-torquing to avoid damage to the valve housing. After installation, pressurize the system gradually and inspect joints for leaks. Periodically check the valve for proper operation and clear any debris that might impede the closing action.
Usage recommendations
Ensure the valve is installed in the correct orientation with respect to flow direction and that operating temperatures and fluid properties match the valve's intended use for water and heating systems. Regular inspection and maintenance will prolong service life and maintain reliable non-return performance.

## FAQ

### How much does the Check Valve FERRO ZZK4 PN16 5/4" cost, and is it available for purchase?

The price is 25.49 € (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 15.07.2026 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/11835819/67235560_large.webp