# SpiroFlex 160/125 reducing adapter (OC) nipple — concentric pipe reducer 160→125 mm

**URL:** https://aio.lv/en/product--spiroflex-red160125-oc--11823057
**Data updated:** 2026-03-09 11:11 (EET)
**Category:** Ventilation Filters
**Manufacturer:** SpiroFlex
**Manufacturer code:** RED160/125-OC
**EAN:** 5907520988694
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 9.99 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 8.26 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--spiroflex-red160125-oc--11823057

## 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

Concentric reducing adapter from SpiroFlex for ductwork: 160 mm inlet to 125 mm outlet (OC nipple). Designed to connect round metal ducts or fittings with different diameters while maintaining airflow alignment. Suitable for HVAC ventilation, exhaust systems, and air distribution in residential or commercial installations where a smooth transition between 160 mm and 125 mm circular ducts is required.

## Long description

SpiroFlex 160/125 reducing adapter (OC) nipple — concentric pipe reducer 160→125 mm is a metal duct fitting designed to join circular ducts of different diameters while keeping the airflow axis aligned. The adapter provides a smooth, concentric transition from a 160 mm inlet to a 125 mm outlet and is intended for use in ventilation and exhaust systems in residential and commercial installations. Constructed to fit standard round metal ductwork, this concentric reducer helps maintain consistent airflow characteristics and simple mechanical connection between sections.
Advantages
The concentric design preserves the duct axis, minimising turbulence and pressure losses compared with abrupt or eccentric transitions. Manufactured for compatibility with round metal ducts, the adapter allows a secure slip-fit connection and can be combined with clamps, seals, or rivets for mechanical fastening. Its straightforward geometry simplifies installation and reduces the need for additional fittings where a concentric diameter change is required.
Suitable for
HVAC ventilation ducts in residential buildings
Commercial and light-industrial exhaust systems
Air distribution networks requiring a concentric diameter transition
Retrofit or repair work where a 160 mm to 125 mm reduction is needed
Key specifications
Type: concentric reducing adapter (nipple)
Inlet diameter: 160 mm
Outlet diameter: 125 mm
Material: metal suitable for ductwork (galvanised or similar finish typical for round ducts)
Connection style: slip-fit concentric join intended for clamps, seals, or rivets
Intended use: air ventilation and exhaust applications
How to use
Position the 160 mm end on the upstream duct and slide the 125 mm outlet into the downstream duct or fitting, ensuring the adapter remains concentric with the duct axis. Secure the joints using appropriate clamps, pop rivets, or duct sealant to achieve an airtight or mechanically robust connection as required by the installation. Check alignment and support the duct runs to avoid stress on the adapter and maintain consistent airflow. Follow local ventilation codes and manufacturer guidance for fastening and sealing methods.
Usage recommendations
Use the SpiroFlex concentric reducer where maintaining the central airflow axis is important and where a direct 160→125 mm transition is needed. For installations requiring reduced noise or maximum aerodynamic efficiency, ensure smooth internal transitions and avoid sharp bends immediately adjacent to the adapter. Inspect seals and mechanical fastenings periodically in commercial or high-use systems.

## FAQ

### How much does the SpiroFlex 160/125 reducing adapter (OC) cost, and is it available for purchase?

The price is 9.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 8 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 SpiroFlex 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 SpiroFlex 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/11823057/67225046_large.webp