# Compression welded coupling SiGMA-Li GZ. 25x1 for PE-RT pipes

**URL:** https://aio.lv/en/product--sigma-li-pertzz251--11825353
**Data updated:** 2026-03-09 11:14 (EET)
**Category:** Home & DIY Accessories
**Manufacturer:** SiGMA-Li
**Manufacturer code:** PERTZZ251
**EAN:** 5902814627617
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 11.49 €
**Prices and availability valid until:** 2026-08-08 23:59
**Price without VAT (21%):** 9.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sigma-li-pertzz251--11825353

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 27.07.2026 | free |
| Pickup points | 30.07.2026 | 1.89 EUR |
| Courier delivery to door | 30.07.2026 | 4.99 EUR |

## Summary description

Welded coupling SiGMA-Li GZ. 25x1 designed for joining PE-RT (polyethylene of raised temperature resistance) pipes with a nominal size of 25 mm and 1" thread equivalence. The metal coupling provides a secure, pressure-resistant joint for plumbing and heating installations, suitable for potable water and underfloor heating systems. Intended for professional installation with appropriate welding or compression tooling.

## Long description

Welded coupling SiGMA-Li GZ. 25x1 for PE-RT pipes is a metal compression-style fitting designed to join PE-RT (polyethylene of raised temperature resistance) pipes with a 25 mm nominal diameter and a 1" thread equivalence. The coupling creates a pressure-resistant connection suitable for potable water and heating circuits, including underfloor heating. Intended for installation by trained professionals, the fitting is compatible with standard PE-RT pipe dimensions and common compression/welding techniques used in plumbing and HVAC systems.
Advantages
The coupling combines a corrosion-resistant metal body with a geometry engineered for stable compression and leak-free performance under thermal cycling. Its design reduces the risk of joint movement or loosening when used in pressurised potable water and heating systems. The product supports reliable long-term operation in closed-loop heating and domestic water supply installations when installed according to manufacturer and industry guidelines.
Suitable for
Connecting 25 mm PE-RT pipes in potable water distribution
Joining PE-RT pipes in underfloor heating manifolds and circuits
Repairing or modifying plumbing runs where a threaded interface is required
Applications requiring a compact, pressure-rated metal coupling for polymer pipes
Key specifications
Compatible pipe material: PE-RT (polyethylene of raised temperature resistance)
Nominal pipe diameter: 25 mm
Thread equivalence: 1" (threaded interface size equivalence for connection)
Connection type: compression/welded metal coupling for polymer pipes
Typical applications: potable water systems, heating circuits, underfloor heating
Suitable for professional installation with appropriate tools
How to use
Prepare pipe ends by cutting squarely and deburring to ensure full insertion and even compression. Slide the coupling components onto the pipe and assemble according to the connection method specified by the installer—either by compression tightening or the approved welding technique for PE-RT systems. Verify that the pipe is fully inserted to the correct depth and that compression nuts or welding collars are positioned as required. After assembly, perform a pressure test in line with local regulations and project specifications to confirm leak tightness before commissioning.
Usage recommendations
Use only with PE-RT pipes of compatible dimensions and wall thickness; follow relevant standards and the pipe manufacturer's guidelines. Installations should be executed by qualified personnel using correct compression torque settings or welding parameters. Avoid exposure to incompatible chemicals and mechanical stresses that exceed system design limits. Conduct pressure and temperature testing after installation and integrate proper thermal expansion allowances in heating circuits.

## FAQ

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

The price is 11.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 18 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 27.07.2026 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/11825353/67227097_large.webp