# Air compressor accessory Proline 66304 — 3/8" thread fitting

**URL:** https://aio.lv/en/product--proline-5663047--10786473
**Data updated:** 2026-03-12 10:13 (EET)
**Category:** Air Compressors
**Manufacturer:** Proline
**Manufacturer code:** 5663047
**EAN:** 5903755663047
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 4.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 4.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proline-5663047--10786473

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.06.2026 | free |
| Pickup points | 29.06.2026 | 1.99 EUR |
| Courier delivery to door | 29.06.2026 | 4.99 EUR |

## Summary description

Proline 66304 is an air compressor accessory with a 3/8" threaded connection. Designed to join or adapt pneumatic fittings and hoses, this threaded fitting provides a secure mechanical connection for compressed air systems. It is suitable for workshop and industrial applications where a 3/8" thread interface is required for tools, hoses, or adapters.

## Long description

Proline quick connector with valve and internal thread is designed for joining pneumatic system components, providing a fast and secure connection between air supply parts. The connector features a 3/8" internal thread and is manufactured from quality materials to ensure durability and resistance to high pressure.
Advantages
The Proline quick connector offers rapid connection and disconnection, an integrated valve to prevent air loss when disconnected, and a 3/8" internal thread for compatibility with standard pneumatic fittings. Its robust construction provides long service life and reliable operation under typical workshop pressures.
Suitable for
Air compressors and pneumatic tools
Workshop air lines and fittings
Maintenance and assembly tasks requiring quick air connections
Key specifications
Brand: Proline
Model / MPN: 5663047
EAN: 5903755663047
Thread: 3/8" internal thread
Type: Quick connector with valve
How to use
Thread the connector into the corresponding 3/8" male port on the air line or component, ensuring threads are clean and, if required, sealed with appropriate tape or sealant. Push the mating quick-fit plug into the connector until it locks; the integrated valve will close automatically when the plug is removed, minimizing air loss. Inspect connections for leaks before use and follow the compressor's pressure limits.
Usage recommendations
Use the connector with compatible 3/8" threaded fittings, keep the valve and sealing surfaces free of debris, and avoid exceeding the recommended operating pressure of your pneumatic system. Regularly inspect for wear or damage and replace if leaks or mechanical faults appear.

## Specifications

| Feature | Value |
|---|---|
| Connecting thread | 3/8 |
| Quantity per pack | 1 pc(s) |

## FAQ

### How much does the Air compressor accessory Proline 66304 cost, and is it available for purchase?

The price is 4.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 237 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 22.06.2026 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 Proline 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 Proline 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/10786473/64449321_large.webp