# Fiber Optical Adapter Duplex ST/SC InLine 89991D

**URL:** https://aio.lv/en/product--inline-89991d--1040077
**Data updated:** 2026-01-03 12:46 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** InLine
**Manufacturer code:** 89991D
**EAN:** 4043718257157
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 14.99 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 12.39 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--inline-89991d--1040077

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 17.07.2026 | free |
| Pickup points | 22.07.2026 | 1.99 EUR |
| Courier delivery to door | 22.07.2026 | 4.99 EUR |

## Summary description

The InLine Fiber Optical Adapter Duplex ST/SC features a grey metal sleeve with flange, suitable for multi-mode fiber connections. It has a beige color and comes in a polybag. This adapter is designed for reliable connectivity and ease of installation, making it ideal for various networking applications.

## Long description

The InLine Fiber Optical Adapter Duplex ST/SC 89991D is a panel-mount bush adapter for multi-mode fiber connections. It incorporates a precision metal ferrule and a grey metal sleeve with flange for secure placement in optical patch panels, distribution trays, wall boxes and similar mounting points. The adapter is supplied in beige colour and packaged in a polybag for protection during transport and storage.
Advantages
The duplex ST/SC adapter provides accurate coupling and alignment of ST and SC connectors through its internal metal ferrule, ensuring consistent multi-mode performance. Its flange and screw-compatible design simplifies installation into patch panels and distribution frames. The metal sleeve increases mechanical durability, while the compact bush form factor allows dense panel layouts.
Suitable for
 Multi-mode fiber patching in LAN and campus networks
 Mounting into optical patch panels and distribution trays
 Wall box and enclosure terminations
 Fiber backbone and cross-connect applications
Key specifications
 Type: Duplex ST/SC fibre optical adapter
 Brand: InLine
 MPN: 89991D
 EAN: 4043718257157
 Ferrule material: metal (precision internal ferrule)
 Sleeve colour: grey metal with flange
 Colour (housing): beige
 Packaging: polybag
 Application: multi-mode fibre
How to use
Insert the adapter into the designated cut-out or flange mounting position on the patch panel, distribution tray or wall box and secure with the provided screws or clips. Align the ST and SC connectors with the adapter ports and push until the connectors engage. For duplex links, connect matching transmitter and receiver fibers to maintain correct signal routing. Ensure connector endfaces are clean before mating to prevent attenuation or damage.
Usage recommendations
For reliable performance, use this InLine 89991D adapter with clean, undamaged ST and SC connectors and follow standard fibre handling procedures. Inspect and clean connector endfaces with appropriate fibre cleaning tools before each connection and avoid excessive mechanical stress on mounted adapters during installation.

## Specifications

| Feature | Value |
|---|---|
| Product colour | Beige |
| Package type | Polybag |
| Connector type | SC/ST |
| Fiber mode structure | Multi-mode |
| Number of connectors | 2 |
| Duplex | Yes |
| Quantity per pack | 1 pc(s) |

## FAQ

### How much does the Fiber Optical Adapter Duplex ST/SC InLine 89991D cost, and is it available for purchase?

The price is 14.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 282 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 17.07.2026 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. 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 InLine 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 InLine 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

### Where can I download the instructions for Fiber Optical Adapter Duplex ST/SC InLine 89991D?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/1040077/64126561_large.webp