# Automatic Air Vent Valve for Radiators CALEFFI 1" Left (507621)

**URL:** https://aio.lv/en/product--caleffi-507621--11699815
**Data updated:** 2026-03-08 08:45 (EET)
**Category:** Heating Radiators
**Manufacturer:** CALEFFI
**Manufacturer code:** 507621
**EAN:** 8016615010268
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 16.49 €
**Prices and availability valid until:** 2026-07-11 23:59
**Price without VAT (21%):** 13.63 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--caleffi-507621--11699815

## 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

Automatic air vent valve for radiators by CALEFFI, 1" connection, left-hand orientation (model 507621). Designed to remove trapped air from radiator and heating circuits automatically to maintain system efficiency and reduce noise. Suitable for installation on radiator bodies or returns where a left-threaded 1" port is required; commonly used in residential and commercial hot-water heating systems.

## Long description

The Automatic Air Vent Valve for Radiators CALEFFI 1" Left (model 507621) is an automatic venting fitting designed for hot-water radiator systems. It removes accumulated air from radiators and heating circuits to maintain circulation efficiency and reduce operational noise. The valve features a left-hand 1" connection suitable for installation on radiator bodies or return lines where left-threaded connections are required.
Advantages
This automatic air vent provides continuous, unattended elimination of air pockets, helping to prevent cold spots and improve heat transfer. Its compact construction allows straightforward fitting on radiator outlets or returns without altering system layout. The left-hand 1" threading ensures compatibility with left-oriented ports on radiators and manifolds. Materials and design are intended for long service life in typical hot-water heating environments.
Suitable for
Removing trapped air from residential radiators
Automatic venting on commercial hot-water heating circuits
Installation on radiator bodies or return lines with left-threaded 1" ports
Maintenance-free continuous air elimination in closed heating systems
Key specifications
Connection orientation: left-hand threaded
Connection size: 1" thread
Function: automatic air venting for heating circuits and radiators
Application: hot-water central heating systems
Mounting location: radiator body or return line
How to use
Install the valve on the radiator body or return line at the designated vent port with the left-hand 1" thread. Ensure the system is depressurised or isolated according to local installation procedures before fitting. Tighten the valve securely using appropriate tools, taking care not to overtighten and damage threads. After installation, pressurise the system and check for leaks; the valve will automatically release trapped air during normal operation. Periodically inspect the vent for signs of leakage or blockage and replace if necessary.
Usage recommendations
Fit the automatic air vent at a high point or designated vent location to maximise effectiveness. When servicing, follow system isolation and safety procedures and use replacement parts that match the thread orientation and size.

## FAQ

### How much does the Automatic Air Vent Valve CALEFFI 1" Left 507621 cost, and is it available for purchase?

The price is 16.49 € (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 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 CALEFFI 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 CALEFFI 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/11699815/67083058_large.webp