# ARCO COMBI Adaptor 3/8" x 3/4" for Combi Valves

**URL:** https://aio.lv/en/product--arco-combi89u--12518746
**Data updated:** 2026-06-12 15:48 (EEST)
**Category:** Other goods
**Manufacturer:** ARCO
**Manufacturer code:** COMBI89U
**EAN:** 8428519067970
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 4.49 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 3.71 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--arco-combi89u--12518746

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 19.06.2026 | free |
| Pickup points | 26.06.2026 | 1.99 EUR |
| Courier delivery to door | 26.06.2026 | 4.99 EUR |

## Summary description

The ARCO COMBI adaptor, model COMBI89U, is a high-quality plumbing component designed for connecting 3/8" and 3/4" threaded systems. This durable adaptor is specifically engineered for use with ARCO Combi valves, ensuring a secure and leak-proof connection in water supply installations. It is an essential fitting for professional plumbing maintenance and system upgrades, providing reliable performance and compatibility in various piping configurations.

## Long description

The ARCO COMBI adaptor is a high-quality plumbing component designed to facilitate seamless connections between 3/8" and 3/4" threaded systems. Engineered specifically for use with ARCO Combi valves, this brass fitting ensures a secure, leak-proof integration within water supply installations. Its robust construction provides the durability required for professional plumbing maintenance and system upgrades, offering reliable performance across various piping configurations.
Advantages
This adaptor is manufactured from high-grade brass, which offers excellent resistance to corrosion and mechanical wear, ensuring a long service life in demanding plumbing environments. The precision-engineered threads allow for a tight, reliable seal, minimizing the risk of leaks and reducing the need for frequent maintenance. Its compact design makes it an ideal solution for tight spaces where standard fittings might be difficult to install, while its compatibility with ARCO Combi valves guarantees a perfect fit for standardized water systems.
Suitable for
Connecting 3/8" and 3/4" threaded plumbing components
Integration with ARCO Combi valves in water supply systems
Professional plumbing maintenance and system upgrades
Residential and commercial water piping configurations
When it may not be suitable
This adaptor is not intended for use with high-pressure gas lines or chemical transport systems where specific material compatibility is required. It is also not suitable for connections involving non-standard thread types or diameters outside of the specified 3/8" and 3/4" dimensions.
Key specifications
Material: Brass
Connection type: 3/8" to 3/4" threaded
Thread specification: 3/4" external thread
Compatibility: ARCO Combi valves
How to use
To install the ARCO COMBI adaptor, ensure the water supply is turned off and the system is depressurized. Clean the threads of both the valve and the pipe to remove any debris. Apply appropriate thread sealant or PTFE tape to the male threads if necessary to ensure a watertight seal. Carefully thread the adaptor onto the valve and the corresponding pipe connection, tightening it with a suitable wrench until secure. Avoid overtightening to prevent damage to the threads or the valve body.
What to consider before purchase
Verify the thread sizes of your existing plumbing system
Ensure compatibility with your specific ARCO valve model
Check local plumbing codes for material requirements
Confirm that the installation space allows for the use of a wrench
Usage recommendations
Regularly inspect the connection for signs of moisture or leaks after the initial installation and during routine maintenance checks to ensure continued system integrity.

## FAQ

### How much does the ARCO COMBI Adaptor 3/8" x 3/4" \| COMBI89U cost, and is it available for purchase?

The price is 4.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 120 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 19.06.2026 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 ARCO 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 ARCO 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/12518746/68868308_large.webp