# REHAU reducer fitting 25×16 mm — plumbing connection for PEX/PE-RT pipes

**URL:** https://aio.lv/en/product--rehau-257376003--11826710
**Data updated:** 2026-03-09 11:16 (EET)
**Category:** Kitchen & Bathroom Faucets
**Manufacturer:** REHAU
**Manufacturer code:** 257376003
**EAN:** 5905505257995
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 8.49 €
**Prices and availability valid until:** 2026-07-25 23:59
**Price without VAT (21%):** 7.02 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--rehau-257376003--11826710

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

REHAU reducer fitting, model 257376003, designed to join 25 mm to 16 mm PEX/PE-RT plumbing pipes. This mechanical/plumbing connector provides a secure transition between different pipe diameters in heating, potable water, and general plumbing systems. Suitable for use in manifold, branch, or repair applications where a reliable diameter reduction is required.

## Long description

REHAU reducer fitting 25×16 mm is a mechanical plumbing connector designed to join PEX and PE-RT pipes with a seamless transition from 25 mm to 16 mm diameter. Intended for use in heating, potable water and general plumbing systems, the fitting delivers a compact, stable connection where a reduction in pipe size is required. The product suits manifold branches, distribution lines and repair points, providing a straightforward way to adapt pipe networks while maintaining flow and system integrity.
Advantages
This REHAU reducer fitting provides a secure mechanical connection between two different pipe diameters without the need for complex tools or adhesive bonding. Its design supports reliable sealing and consistent hydraulic performance in potable water and heating circuits. The compact dimensions allow installation in confined spaces and simplify branch-offs or repairs. Compatibility with PEX and PE-RT materials ensures broad applicability across common polymer plumbing systems.
Suitable for
 Reducing main distribution lines to branch circuits
 Connecting manifold outlets to smaller-diameter risers
 Repairing or modifying existing PEX/PE-RT installations
 Applications in underfloor heating and potable water systems
Key specifications
 Connection diameters: 25 mm to 16 mm
 Compatible pipe types: PEX, PE-RT
 Application areas: heating systems, potable water distribution, general plumbing
 Mechanical joining method suitable for press or compression-style installation (depending on system)
 Compact form factor for use in tight installation spaces
How to use
Prepare pipe ends by cutting square and deburring to ensure a smooth fit. Slide the fitting onto the 25 mm pipe and insert the 16 mm pipe into the opposite end, following system-specific assembly instructions for press, crimp or compression connections as applicable. Verify alignment and engagement depth and perform the recommended joining operation with appropriate tooling. After installation, check for leaks and pressure integrity according to local regulations and system requirements.
Usage recommendations
Use compatible installation tools and follow REHAU or system supplier guidelines for joining PEX and PE-RT pipes. Confirm pipe wall dimensions and manufacturer tolerances before assembly, and perform a pressure test after installation to ensure a reliable, leak-free connection.

## FAQ

### How much does the REHAU reducer fitting 25×16 mm 257376003 cost, and is it available for purchase?

The price is 8.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 49 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 14.07.2026 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 REHAU 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 REHAU 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/11826710/68525884_large.webp