HDPE Butt Fusion Flat-Plate Rainwater Hopper for Siphonic Drainage

A flat-plate rainwater hopper manufactured from high-density polyethylene, designed to be flush with the finished roof surface for clean installation.

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Category: HDPE Siphonic Fittings

HDPE Siphonic Fittings

Product Overview

A flat-plate rainwater hopper manufactured from high-density polyethylene, designed to be flush with the finished roof surface for clean installation. This HDPE flat-plate rainwater hopper sits level with the roof membrane for a clean, walkable finish, feeding siphonic drainage stacks at full bore. Meets ISO 8770 and EN 1519-1 for DN 50 to 315 mm siphonic roof drainage systems.

Quick Information

Diameter Range: DN 50 - 315 mm
Applicable Standards: ISO 8770, EN 1519-1
Stock: In stock

Specification Table

Article	d1/d2	K	k1	k2	k3	D1	D2	L
Outlet	56.8	197.0	56.0	126.0	114.5	224.0	245.0	3.4
Outlet	75.2	194.0	56.0	124.0	112.5	224.0	245.0	4.0
Outlet	90	197.0	56.0	124.0	112.5	224.0	245.0	4.2
Outlet	110.5	192.0	56.0	121.0	109.5	224.0	245.0	6.2
Outlet	125.6	168.0	56.0	93.0	85.0	211.0	221.0	6.1

Key Features

Flush Flat-Plate Design: The HDPE flat-plate rainwater hopper mounts level with the finished roof, creating a clean walkable surface without trip hazards.
Siphonic Performance: This siphonic roof drain primes rapidly and runs at full bore, draining large roof areas with fewer downpipes than gravity systems.
PE100 Weather Resistance: The HDPE flat-plate rainwater hopper withstands UV, ponding water, thermal cycling and rooftop chemicals for decades.
Anti-Vortex Outlet: A precision outlet on this siphonic roof drain prevents air entrainment so siphonic action stays stable at peak design flow.
Leak-Free Fusion Joints: The HDPE flat-plate rainwater hopper welds to HDPE pipe by butt or socket fusion, forming a homogeneous watertight system.
Wide Size Range: This siphonic roof drain covers DN 50 to 315 mm to match any siphonic roof drainage design requirement.

Production

Raw Material

Every HDPE flat-plate rainwater hopper is molded from certified virgin PE100 resin with carbon black UV stabilizer, batch-tested for melt flow rate and density.

Molding Process

Each siphonic roof drain is injection molded with precision cores that form the flat plate and outlet in one cycle, holding dimensional tolerance within 0.1 mm.

Quality Control

Batches of HDPE flat-plate rainwater hoppers are sampled for hydraulic flow testing, dimensional gauging and fusion joint integrity per ISO 8770 and EN 1519-1.

Applications

Exposed flat roofs on offices and retail buildings use the HDPE flat-plate rainwater hopper for a clean flush finish.
Siphonic roof drainage systems on factories and exhibition halls rely on this siphonic roof drain for rapid storm discharge.
Parking decks and podium roofs install the HDPE flat-plate rainwater hopper where a walkable surface is required.
Municipal and industrial facilities choose this siphonic roof drain for maintenance-free long-term roof drainage.