# Compression straight coupling SiGMA-Li for PE-RT pipe 25x1 with union nut

**URL:** https://aio.lv/en/product--sigma-li-pertzps251--11824979
**Data updated:** 2026-03-09 11:14 (EET)
**Category:** Home & DIY Accessories
**Manufacturer:** SiGMA-Li
**Manufacturer code:** PERTZPŚ251
**EAN:** 5902814622469
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 7.49 €
**Prices and availability valid until:** 2026-08-07 23:59
**Price without VAT (21%):** 6.19 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sigma-li-pertzps251--11824979

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 24.07.2026 | free |
| Pickup points | 29.07.2026 | 1.89 EUR |
| Courier delivery to door | 29.07.2026 | 4.99 EUR |

## Summary description

SiGMA-Li compression straight coupling for PE-RT pipe, size 25x1. Designed to join two lengths of PE-RT pipe in plumbing and heating installations. Features a union nut (śrubunek) for secure mechanical connection without soldering or welding. Suitable for potable water and underfloor heating systems where PE-RT piping is used.

## Long description

SiGMA-Li compression straight coupling for PE-RT pipe 25x1 with union nut is a mechanical connector designed to join two lengths of PE-RT pipe in plumbing and heating systems. The fitting provides a secure, solder-free connection using a compression mechanism and a union nut, compatible with PE-RT material and intended for use where reliable water or heat distribution is required. The compact design supports installation in confined spaces and is suitable for systems carrying potable water and for underfloor heating circuits that use PE-RT piping.
Advantages
The compression straight coupling ensures a leak-resistant mechanical joint without the need for heat, soldering or adhesives, reducing installation time and tools required. Its union nut provides reliable axial compression and easy disassembly for maintenance or reconfiguration. Constructed to match PE-RT pipe dimensions, the coupling maintains flow continuity and minimizes pressure drop at the joint. The product is compatible with potable water systems and heating installations when installed according to applicable standards.
Suitable for
Joining two lengths of PE-RT pipe 25x1 in domestic or commercial plumbing
Connecting runs in underfloor heating systems that use PE-RT piping
Situations requiring solder-free mechanical connections and easy maintenance
Key specifications
Type: compression straight coupling with union nut
Pipe compatibility: PE-RT, outer diameter corresponding to 25x1 pipe
Connection method: mechanical compression with union nut
Suitable media: potable water and heating fluids compatible with PE-RT
Installation environment: plumbing and underfloor heating systems
How to use
Prepare both pipe ends by cutting square and deburring the inner and outer edges. Slide the union nut and compression components onto each pipe end according to the manufacturer’s assembly sequence, insert the pipe fully into the coupling body, then tighten the union nut to the specified torque to form the compression seal. Verify alignment and inspect the joint for proper engagement. Pressure-test the system after installation following local codes and standards before regular operation.
Usage recommendations
Use appropriate tools for cutting and tightening; avoid overtightening the union nut to prevent damage to the pipe or fitting. Install in accessible locations when possible to allow future inspection or replacement. Follow system pressure, temperature limits, and installation guidelines for PE-RT piping to ensure long-term performance.

## FAQ

### How much does the Compression straight coupling SiGMA-Li 25x1 cost, and is it available for purchase?

The price is 7.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 10 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 24.07.2026 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 SiGMA-Li 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 SiGMA-Li 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/11824979/67226813_large.webp