Description
This is the upper internal water distributor that sits just below the side‑mount control valve inside a fibreglass (FRP) tank sized roughly 42″–48″ in diameter.
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📍 Location: Top of the media bed, connected into the riser or to the side‑mount piping.
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🌀 Function: Evenly spreads incoming water across the top of the media (sand, resin, carbon) so flow goes uniformly down through the bed.
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🔧 How it looks:
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A central hub that interfaces with the connection from the valve/riser,
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With multiple radial laterals (spokes) extending outward horizontally toward the tank wall.
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These laterals have small slots or holes so water flows out gently and evenly.
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📏 Sizing: Engineered for 6″ flanged openings and side‑mount control valves on large tanks like 42″–48″ FRP vessels.
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📌 Source guidance in distributor charts identifying H173 as the matching top distributor for such vessels.





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