Lesso America
PVC SDR 35 Flush Downspout Adapter (DownSpout x Sewer Hub, H x H)
- SKU:
- LSW218
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
PVC SDR 35 Flush Downspout Adapter (Downspout x Sewer Hub, H x H)
PVC SDR 35 Flush Downspout Adapters provide a streamlined transition from compatible roof downspouts to SDR 35 sewer and drainage piping for efficient stormwater conveyance.
Featuring a downspout hub on one end and an SDR 35 sewer hub on the opposite end, this flush-profile adapter is designed to connect above-ground roof drainage to underground piping while maintaining a clean, compact transition point. The flush-style body helps reduce protrusion at the connection while directing roof runoff into compatible SDR 35 PVC piping. Constructed from durable PVC, the fitting offers resistance to corrosion, moisture, and environmental exposure for dependable use in residential, commercial, and municipal stormwater drainage systems.
Product Highlights
- PVC SDR 35 flush downspout adapter
- Downspout x Sewer Hub configuration
- Hub x Hub connection design
- Connects compatible roof downspouts to SDR 35 PVC piping
- Flush-profile design for a streamlined connection
- Transitions above-ground roof drainage to underground piping
- Downspout-side hub accepts the corresponding downspout profile
- Sewer hub accepts compatible SDR 35 PVC pipe
- Designed for stormwater and drainage applications
- Helps direct roof runoff into underground drainage systems
- Compact design can simplify installation at building drainage points
- Durable PVC construction
- Lightweight for easier handling and installation
- Resistant to corrosion
- Resistant to moisture exposure
- Suitable for outdoor and underground installations
- Suitable for residential drainage systems
- Suitable for commercial drainage systems
- Suitable for municipal stormwater applications
- Designed for non-pressure drainage service
Technical Specifications
| Product Type | PVC SDR 35 Flush Downspout Adapter |
|---|---|
| Material | PVC |
| Connection Type | Downspout Hub x Sewer Hub |
| Connection Configuration | Hub x Hub |
| Body Style | Flush Profile |
| Downspout-Side Connection | Downspout Hub |
| Sewer-Side Connection | SDR 35 Sewer Hub |
| System Type | Stormwater and Drainage |
| Pressure Service | Non-Pressure |
| Primary Function | Transition Roof Downspout Drainage to SDR 35 Underground Piping with a Flush Connection Profile |
| Typical Applications | Roof Drainage, Stormwater Management, Downspout Connections, Underground Drainage, Residential, Commercial, and Municipal Systems |
Connection Configuration
Downspout Hub
The downspout-side hub is designed to accept the corresponding compatible downspout connection and transition roof runoff toward the underground drainage system.
SDR 35 Sewer Hub
The opposite hub accepts compatible SDR 35 PVC sewer pipe, allowing stormwater to continue into an underground drainage network.
Flush-Profile Design
The flush design distinguishes this fitting from a standard downspout adapter by providing a more streamlined connection profile.
This can be useful where the transition point needs to remain compact near a wall, foundation, grade transition, or other space-sensitive drainage location.
The adapter still performs the same basic function of converting the downspout connection to an SDR 35 sewer hub while minimizing unnecessary projection around the transition.
Why Choose a Flush Downspout Adapter?
Streamlined Installation
- Flush-profile body
- Compact downspout transition
- Useful near walls and foundations
- Helps reduce projection at the connection
- Creates a clean transition into underground piping
Stormwater Management
- Routes roof runoff underground
- Connects directly to compatible SDR 35 piping
- Supports organized drainage layouts
- Helps move water away from structures
- Suitable for gravity-flow drainage systems
Typical Applications
Roof Drainage
- Residential downspouts
- Commercial roof drainage
- Building stormwater systems
- Downspout-to-underground transitions
- Rainwater conveyance
Underground Drainage
- SDR 35 stormwater piping
- Yard drainage systems
- Underground runoff conveyance
- Site drainage networks
- Municipal stormwater connections
Construction Details
Manufactured from durable PVC, this flush downspout adapter is designed for long-term use in outdoor and underground drainage environments.
The material provides resistance to corrosion, moisture, and environmental exposure commonly encountered in stormwater applications.
The molded hub connections are designed to provide proper fit with the corresponding downspout connection and compatible SDR 35 PVC sewer pipe.
Installation
Verify the downspout dimensions and SDR 35 sewer pipe size before installation.
Confirm which end is the downspout hub and which end is the SDR 35 sewer hub.
Review available clearance and confirm that the flush-profile configuration is appropriate for the intended wall, foundation, grade, or drainage layout.
Dry-fit the complete assembly before final installation to confirm alignment, downspout position, pipe engagement, and drainage direction.
Cut the mating SDR 35 pipe square and remove burrs or debris that could interfere with proper insertion.
Clean and prepare all PVC solvent-weld surfaces according to accepted installation procedures where solvent welding is required.
Install the downspout side using the connection method appropriate for the specific downspout configuration and secure the SDR 35 side using compatible PVC joining materials as required by the manufacturer.
Maintain proper slope and alignment so roof runoff can drain freely into the underground piping system.
Allow any solvent-welded joints to cure according to the solvent cement manufacturer's recommendations before backfilling or placing the drainage system into service.

Our piping specialists can help review your downspout dimensions, SDR 35 pipe size, available clearance, and stormwater drainage layout before you order.
Email the GetPipe.com Team Visit Quick SupportFrequently Asked Questions
What is a PVC SDR 35 flush downspout adapter used for?
It is used to transition a compatible roof downspout into SDR 35 PVC underground stormwater or drainage piping.
What makes this adapter “flush”?
The supplied product information identifies it as having a flush-profile design intended to provide a more streamlined and compact transition at the downspout connection.
How is this different from a standard SDR 35 downspout adapter?
Both transition a downspout to an SDR 35 sewer hub, but the flush version is designed with a lower-profile connection for installations where a more compact transition is preferred.
What does Downspout x Sewer Hub mean?
It means one side is designed for the corresponding downspout connection while the other side is a sewer hub designed to receive compatible SDR 35 PVC pipe.
What does H x H mean?
H x H means Hub x Hub. Both sides use hub-style connections, although each hub is designed for a different mating component.
Are both hubs the same size and shape?
No. The downspout-side hub matches the intended downspout profile, while the sewer-side hub is sized for compatible SDR 35 PVC pipe.
Can this fitting connect a roof downspout directly to underground drainage?
Yes. That is its primary purpose: transitioning roof runoff from an above-ground downspout into compatible underground SDR 35 piping.
Is this fitting intended for stormwater service?
Yes. The supplied product information identifies stormwater management and roof drainage as intended applications.
Can it be installed underground?
Yes. The sewer side is designed for integration with SDR 35 underground drainage piping.
Is this fitting intended for pressure service?
No. It is intended for gravity-flow, non-pressure stormwater and drainage applications.
Why should I verify the downspout dimensions?
Downspouts are produced in different sizes and profiles, so confirming the actual dimensions helps ensure the fitting matches the intended connection.
What should I verify before ordering?
Confirm the downspout size and profile, SDR 35 sewer pipe size, available installation clearance, hub configuration, and compatibility with the intended stormwater system.
Important Ordering & Installation Notes
- This listing is for a PVC SDR 35 Flush Downspout Adapter.
- Connection configuration is Downspout x Sewer Hub, H x H.
- H x H means Hub x Hub.
- Verify both connection sizes before ordering.
- Confirm the actual downspout dimensions and profile.
- Confirm the SDR 35 sewer pipe size.
- The two hub ends are intended for different mating components.
- Do not assume both hubs use the same dimensional standard.
- The flush design provides a more streamlined connection profile.
- Confirm that the flush configuration is appropriate for the available installation space.
- The downspout side is designed for the corresponding roof drainage connection.
- The sewer hub is designed to receive compatible SDR 35 PVC pipe.
- Confirm which end is the downspout connection before installation.
- Confirm which end is the SDR 35 sewer connection before installation.
- Dry-fit the complete assembly before final joining.
- Verify downspout alignment and underground pipe position.
- Maintain proper drainage slope through the underground piping system.
- Cut SDR 35 pipe square before installation.
- Remove burrs and debris from mating surfaces.
- Use compatible PVC primer and solvent cement where required by the connection.
- Follow manufacturer instructions for the downspout-side connection.
- Fully seat the SDR 35 pipe into the sewer hub where applicable.
- Maintain proper alignment while solvent-weld joints set.
- Allow completed solvent-weld joints to cure according to the cement manufacturer's recommendations before service or backfilling.
- This fitting is intended for non-pressure stormwater and drainage applications.
- Suitable applications may include residential, commercial, and municipal roof drainage systems.
- Consult manufacturer documentation for complete dimensions and connection details.
- Follow applicable plumbing, stormwater, and drainage codes.