Are these just for rj45 ports or do they fit into an sfp port?

They fit into the RJ45 Port on the networking devices. For copper sfp, it's a little bit short.

What is the difference between sfp-a and sfp-b? which one do i need for a udm (ubiquiti dream machine)?

SFP-B TYPE:14x12x17mm/0.55x0.47x0.67in (LxWxH) Facing side is more like square. SFP-A TYPE:15x10x12mm/0.59x0.39x0.47in (LxWxH) Facing side is rectangle. SFP-B is a little big tight than SFP-A; SFP-A is suitable and flexible, SFP-B is durable and Tighter. They are both fit in the slots of networking machines.

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RJ45 Dust Covers Caps Ethernet Port Plugs Suitable for Open Slot on Network Switch Silicone 20pcs/Pack

RJ45 Dust Covers Caps Ethernet Port Plugs Suitable for Open Slot on Network Switch Silicone 20pcs/Pack

Product ID: 411641511

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Details

Brand
OPSTRAN
Connector Type
RJ45
Cable Type
Ethernet
Compatible Devices
Network Switch
Special Feature
Soft easy to

⚡Universal RJ45 port compatibility

🔧Easy insert & removal tab

🛡️20-pack silicone dust protection

Description

🛡️ Protect your ports, power your network—dust-free and worry-free!

EXTEND DEVICE LIFESPAN - Prevent dust and oxygen damage to maintain optimal network performance.
UNIVERSAL FIT FOR RJ 45 - Seamlessly fits all standard RJ45 Ethernet ports—no guesswork needed.
HASSLE FREE INSTALLATION - Quickly snap in or remove with the ergonomic tab design—no tools required.
SHIELD YOUR NETWORK PORTS - Keep your Ethernet switches and devices pristine with durable silicone caps.
BULK PACK FOR MAXIMUM COVERAGE - 20 caps per pack to protect your entire network setup or multiple devices.

This 20-pack of black silicone RJ45 dust cover caps offers universal protection for all Ethernet RJ45 ports. Designed for easy insertion and removal with a convenient tab, these durable TPE rubber plugs shield your network switches, routers, and fiber optic devices from dust and oxygen exposure, ensuring long-lasting device performance and reliability.

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