FOSCYA4 Dome Type Heat Shrinkable Fiber Optic Splice Closure

Deploying FirstFiber’s FOSCYA4 dome closure across our regional distribution network solved several mid-span cable management challenges. Featuring a 4-port configuration—3 round branch ports (16 mm) and 1 primary oval port (25 mm) specifically designed for uncut feeder cables—it allows our field crews to execute clean mid-span loops without interrupting active fibers. The unit’s 4 dual-layer splice trays cleanly organize up to 96 bunchy fibers (24 fibers per dual-layer tray) or 144 ribbon fibers, while the loose tube holding tray prevents buffer tube clutter. Constructed from high-impact Polycarbonate and sealed with thermoplastic rubber grommets, it operates reliably across a wide -40°C to +65°C range, keeping splices bone-dry in both aerial pole-mounts and flooded manholes.

At a reference baseline price of $27 USD, the FOSCYA4 offers outstanding commercial value for municipal and enterprise B2B network builds. Measuring 440 (H) × 190 (D) mm with a manageable net weight of 2.35 kg to 2.6 kg, the enclosure is easy for technicians to position and mount overhead. The product arrives as a complete turnkey package equipped with standard accessories, including heat-shrink protective sleeves, hanging hoops for pole/wall installation, an M10 wrench, nylon ties, grounding wire, abrasive cloth, and protective aluminum-foil paper. Its ability to house up to 144 ribbon fibers makes it a highly scalable choice for growing FTTx networks.

We standardized on the FOSCYA4 for underground duct, pipeline, and direct-buried splicing contracts due to its rigid Polycarbonate outer body. The heavy-duty plastic hoop clamp and heat-shrink sealing sleeves withstand heavy soil pressure and vibration without leaking. We opted to add the optional pressure testing valve to perform air tightness checks prior to backfilling underground trenches. Available in core capacities ranging from 24 Cores to 96 Cores, this closure gives our installation teams an organized, highly dependable solution for long-term outdoor cable jointing.