# Compression coupling REHAU 20 mm to G3/4 threaded connection (model 137985001)

**URL:** https://aio.lv/en/product--rehau-137985001--11826913
**Data updated:** 2026-03-09 11:16 (EET)
**Category:** Home & DIY Accessories
**Manufacturer:** REHAU
**Manufacturer code:** 137985001
**EAN:** 5905505257537
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 8.49 €
**Prices and availability valid until:** 2026-07-29 23:59
**Price without VAT (21%):** 7.02 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--rehau-137985001--11826913

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

REHAU compression coupling, model 137985001, for joining 20 mm plastic or multilayer pipe to a G3/4 external/internal threaded fitting. Designed for secure mechanical connection where a push-fit-to-thread transition is required. Suitable for plumbing, heating and water supply installations, providing compact mechanical sealing without soldering or adhesive.

## Long description

Compression coupling REHAU 20 mm to G3/4 threaded connection is a mechanical adapter designed to join 20 mm plastic or multilayer pipe to a G3/4 external or internal threaded fitting. The coupling provides a compact, mechanical seal without the need for soldering or adhesive, enabling a secure transition from push-fit pipe systems to standard G3/4 threaded components in plumbing, heating and water supply applications.
Advantages
The coupling ensures reliable, leak-resistant connections and simplifies installation by eliminating the need for heat or chemical joining methods. Its compact design saves space in confined installations and is compatible with common 20 mm plastic and multilayer pipes. The threaded end accepts G3/4 fittings, allowing integration with valves, taps and appliances that use standard G3/4 threads. Materials and construction are intended for long-term mechanical performance in potable water and heating systems when installed according to instructions.
Suitable for
Connecting 20 mm plastic or multilayer pipe to G3/4 threaded valves and fixtures
Domestic and commercial hot and cold water distribution systems
Heating circuit connections where a push-fit to thread transition is required
Repair or modification of existing piping to add threaded components
Key specifications
Pipe connection: 20 mm compression for plastic or multilayer pipe
Threaded connection: G3/4 compatible external/internal thread
Function: Mechanical compression coupling for secure, solder-free joints
Application areas: Plumbing, heating, water supply systems
Design: Compact form factor for space-limited installations
How to use
Prepare the pipe end by cutting squarely and removing any burrs. Slide the compression nut and insert the sleeve if required, push the pipe fully into the coupling until it seats against the internal stop, then tighten the compression nut to create the mechanical seal. Thread the G3/4 connection onto the corresponding fitting and tighten to the recommended torque for the mating component. Follow standard installation practices and local codes for water and heating systems.
Usage recommendations
Use with compatible 20 mm plastic or multilayer pipes and G3/4 threaded fittings only. Verify pipe material and wall thickness meet manufacturer guidelines. Do not use solvents or solder; ensure connections are tightened to appropriate torque and inspect for leaks after pressurization. For installations in heating systems, follow recommended temperature and pressure limits for plastic and multilayer piping.

## FAQ

### How much does the REHAU compression coupling 137985001 20 mm → G3/4 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 — 19 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 16.07.2026 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/11826913/67228307_large.webp