24-Core Dome Fiber Optic Splice Closure (Mechanical Seal) – Weatherproof Splice Protection Built to Last

A fiber splice is only as reliable as the enclosure protecting it. You can have the cleanest fusion splice in the network, but if the closure around it lets in moisture — from a single wet season, a flooded manhole, or years of condensation — the whole joint eventually fails. The 24-Core Dome Fiber Optic Splice Closure is built specifically to prevent that from ever happening. With an IP68-rated mechanical seal, UV-resistant construction, and a design rated for over 20 years of outdoor service, this closure is the kind of infrastructure component you install once and forget about — in the best possible way.

What Makes This Dome Splice Closure Different?

Most splice closures on the market use heat-shrink sealing — which works fine the first time, but creates a real problem the moment you need to get back in. You need a heat gun, you destroy the seal, and you start over with new consumables. The mechanical seal on this closure changes that entirely. A high-quality silicone rubber gasket seals both the body and the cable entry ports, creating an IP68-rated barrier against water and dust without a single drop of heat applied. Open it for a network upgrade, reseal it in minutes, and move on. No special tools, no consumables, no waiting.

The dome shape is not just aesthetic — it is functional. Vertical enclosures like this naturally shed water and debris, reducing the surface area exposed to standing moisture in buried or aerial applications. The body is moulded from high-impact PP and ABS plastics with built-in UV stabilisation, meaning it does not yellow, crack, or become brittle after years of direct sun exposure in tropical or high-altitude environments.

Key Features of the 24-Core Dome Fiber Optic Splice Closure

• 24-Core Capacity: Supports up to 24 fiber optic connections with dedicated internal splice trays — enough for a primary distribution point in most FTTH branch deployments.
• IP68 Mechanical Seal: Silicone rubber gaskets on the body and cable ports provide fully waterproof and dustproof protection without heat-shrink tubing or special sealing tools.
• Reusable Seal Design: The mechanical seal can be opened and resealed multiple times across the life of the network, making future expansions and maintenance straightforward and cost-effective.
• High-Impact PP and ABS Construction: UV-resistant, chemical-resistant materials that maintain their structural integrity from -40°C to +85°C — built for the full range of outdoor conditions.
• Flip-Style Splice Trays: Internal trays flip open individually, giving clean access to specific fibers without disturbing adjacent splices — a detail that matters enormously during live network maintenance.
• Versatile Mounting Options: Suitable for pole-mounted aerial installations, wall mounting, manhole deployment, and direct burial — one closure type covers multiple infrastructure scenarios.

Technical Specifications

Mechanical Seal vs Heat-Shrink – Why It Matters in the Field

This is one of the most practical decisions in fiber infrastructure planning, and it is worth being direct about it. Heat-shrink closures are a one-way commitment — once sealed, getting back in requires destroying the seal and replacing consumables. That adds cost and time to every future maintenance visit. Mechanical seals eliminate that problem entirely:

1. Repeatable Access: Open and reseal as many times as your network requires, with no new consumables and no specialist tools. For networks that will grow over time, this alone justifies the choice.
2. Faster Installation: No heat gun, no blowtorch, no waiting for seals to cool. A technician can seal the closure and move to the next span significantly faster than with heat-shrink alternatives.
3. Consistent, Even Sealing: The mechanical structure applies uniform pressure around every cable port, removing the risk of cold spots or uneven heating that can leave a heat-shrink seal partially compromised.

Applications for the 24-Core Dome Splice Closure

This closure is designed for outdoor environments where the margin for moisture ingress is exactly zero. It is the right fit for FTTH primary and secondary distribution points, where a single closure may serve multiple drop cables branching off to customer premises. It works equally well protecting backbone splices on aerial utility poles, in underground manholes alongside other passive fiber components from ECA Networks, and in direct-buried installations where the seal must hold against soil moisture and pressure for years without inspection. For broadband and CATV backbone deployments, the 20-year rated lifespan means this closure will still be performing long after the active equipment around it has been upgraded twice over.

Why Source Your Splice Closures from ECA Networks?

A low-quality splice closure is one of those things you do not notice until it has already caused a network outage — and by then, the cost of re-entry, re-splicing, and downtime far exceeds whatever was saved at purchase. At ECA Networks, we supply dome splice closures that are built to the IP68 standard they are labelled with — not approximations of it. We stock these for ISPs, telecoms contractors, and utility teams across East Africa who are deploying infrastructure that needs to keep working through rainy seasons, UV exposure, and years of temperature cycling.

Whether you need a handful of closures for a small FTTH branch deployment or a bulk order for a large backbone rollout, we have the stock, the experience, and the honest product knowledge to help you specify correctly. Browse our full range of fiber optic passive components or get in touch for a project quotation.