# Air compressor accessory Proline 66303 — 1/4" connecting thread

**URL:** https://aio.lv/en/product--proline-5663030--10786472
**Data updated:** 2026-03-12 10:13 (EET)
**Category:** Air Compressors
**Manufacturer:** Proline
**Manufacturer code:** 5663030
**EAN:** 5903755663030
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.49 €
**Prices and availability valid until:** 2026-07-11 23:59
**Price without VAT (21%):** 4.54 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proline-5663030--10786472

## 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

Proline 66303 air compressor accessory with a 1/4" connecting thread for attaching hoses and pneumatic tools. Designed as a coupling/adapter component to ensure secure threaded connections between compressor fittings and pneumatic equipment. Suitable for workshop use, maintenance tasks, and connecting standard 1/4" pneumatic lines and fittings.

## Long description

Proline quick connector with valve and internal thread is designed for connecting pneumatic system components, providing a fast and secure connection between air supply elements. The connector features a 1/4" internal thread and is manufactured from quality materials to ensure durability and resistance to high pressure.
Advantages
The Proline connector combines an integrated shut-off valve and a 1/4" internal thread for straightforward installation and controlled disconnection. Its durable construction provides resistance to wear and maintains a reliable seal under typical pneumatic pressures. Compact dimensions simplify use in confined spaces and routine maintenance tasks.
Suitable for
Connecting hoses and fittings in workshop air supply systems
Use with air tools such as impact wrenches, grinders and spray guns
Maintenance and repair tasks requiring quick tool changes
Pneumatic assemblies in industrial and hobby applications
Key specifications
Brand: Proline
Model / MPN: 5663030
EAN: 5903755663030
Thread type: 1/4" internal thread
Accessory type: quick connector with valve
How to use
Ensure the air supply is shut off and the system is depressurized before installation. Screw the connector onto the matching 1/4" external thread until secure, then attach the mating push-fit or hose end until it clicks into place. Open the air supply and check for leaks; tighten if necessary. To disconnect, shut off the air, depressurize the line, and operate the quick-release mechanism following the valve action.
Usage recommendations
Use with compatible 1/4" fittings and maintain regular inspections for wear or damage. Avoid exposure to corrosive chemicals and exceed manufacturer-recommended pressure limits. Replace the connector if threads or sealing surfaces show visible wear.

## Specifications

| Feature | Value |
|---|---|
| Connecting thread | 1/4 |
| Quantity per pack | 1 pc(s) |

## FAQ

### How much does the Air compressor accessory Proline 66303 cost, and is it available for purchase?

The price is 5.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 251 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 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

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