# Barrow compression fitting THKN-3/8-B03 b, 13/10 mm (inner/outer), black

**URL:** https://aio.lv/en/product--barrow-thkn-38-b03-b--5795716
**Data updated:** 2026-03-07 15:15 (EET)
**Category:** CPU Coolers & PC Cooling Systems
**Manufacturer:** Barrow
**Manufacturer code:** THKN-3/8-B03 b
**EAN:** 6937826601170
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 7.99 €
**Prices and availability valid until:** 2026-07-23 23:59
**Price without VAT (21%):** 6.60 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--barrow-thkn-38-b03-b--5795716

## 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

Barrow compression fitting THKN-3/8-B03 b is a black connector for liquid-cooling tubing specified for 13/10 mm (outer/inner) tube sizes. It provides a push-on compression connection for secure sealing between tubing and components, suitable for PC water-cooling loops and custom cooling assemblies where a 13 mm outer / 10 mm inner bore tube is used.

## Long description

Barrow compression fitting THKN-3/8-B03 b is a black compression connector designed for 13/10 mm (outer/inner) soft tubing used in PC liquid-cooling loops and custom cooling assemblies. The fitting creates a push-on compression seal between tubing and cooling components, providing a compact, low-profile connection for runs where 13 mm outer diameter and 10 mm inner bore tubing is specified.
Advantages
The fitting offers reliable mechanical compression sealing without the need for additional clamps or adhesives, reducing the risk of leaks when installed correctly. Its black finish provides visual consistency in systems with dark tubing or components and helps hide wear marks. The push-on design simplifies installation and removal while maintaining a secure hold under standard operating pressures for typical PC liquid-cooling setups.
Suitable for
 PC water-cooling loops using 13 mm outer / 10 mm inner soft tubing
 Custom liquid-cooling assemblies and tubing runs in desktop systems
 Connections between tubing and radiators, pumps, reservoirs, and water blocks with matching ports
 DIY repairs and upgrades where a compact compression fitting is required
Key specifications
 Finish: black
 Tube compatibility: 13 mm outer diameter, 10 mm inner diameter
 Connection type: push-on compression
 Application: liquid-cooling tubing connector for PC systems
 Form factor: compact, low-profile fitting suitable for tight routing
How to use
Ensure the tubing end is cut square and free of debris before installation. Slide the tubing over the fitting until the compression seat is reached and a snug feel confirms engagement. For best results, push firmly until the tubing abuts the end stop; avoid twisting the tubing excessively during insertion. Verify the connection by visually confirming the tubing has fully seated and by testing the loop under low pressure before powering the system.
Usage recommendations
Use only with soft tubing of the stated dimensions. Inspect fittings and tubing periodically for signs of wear or softening, and perform a pressure or leak test after any maintenance or reconfiguration. Do not exceed the typical operating temperatures and pressures recommended for PC liquid-cooling components.

## FAQ

### How much does the Barrow THKN-3/8-B03 b compression fitting 13/10 mm cost, and is it available for purchase?

The price is 7.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 50 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 Barrow 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 Barrow 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/5795716/68515964_large.webp