Shower Drain Components Under Consideration for the Bathroom Build

As I plan the raised shower platform for the bathroom, I am exploring different components that will allow the shower to drain directly into the interior gray tanks.
Keeping all tanks inside the trailer is a priority for freeze protection, maintenance access, and overall system reliability.
Two products that may play a role in this design are a low-profile shower drain and a compact 12V shower sump pump box.

Scandvik Low Profile Drain Stopper – 1″ Outlet

This drain is designed for marine environments where space is limited and drainage must be routed through tight areas.
Its low-profile design makes it a strong candidate for a raised shower floor where vertical clearance is limited.

Outlet Size: 1 inch
Design: Low-profile for tight installations
Intended Use: Marine showers and wet areas
Potential Benefit: Allows the shower pan to sit lower while still routing water into a sump box

This drain could be mounted directly into the raised shower platform, feeding into a sump pump box located beneath or adjacent to the shower structure.

Zuomeng 12V Automatic Shower Sump Pump Box – 750 GPH

This sump pump box is designed for boats and RVs to collect shower water and automatically pump it to a gray tank.
For a cargo trailer conversion with interior tanks, this type of system allows the shower to drain efficiently even when the gray tanks sit higher than the shower pan.

Brand: Zuomeng
Flow Rate: 750 GPH
Power: 12V DC (corded electric)
Material: ABS housing
Maximum Lifting Height: 10 feet
Item Weight: 4.64 lbs (2.11 kg)
Package Dimensions: 12.05″ × 10.55″ × 5.67″
Model Number: HY-056
Included Adapters: 3/4″, 1″, and 1-1/8″ hose fittings

The sump box collects water from the shower drain and automatically pumps it into the gray tanks, making it ideal for raised shower platforms or installations where gravity drainage is not possible.

How These Components Fit Into the Shower Design

The raised shower platform will allow the drain to sit above the sump box, which then pumps water into the interior gray tanks.
This approach eliminates the need for any tanks mounted under the trailer and keeps all plumbing inside the insulated envelope.

Low-profile drain: Minimizes height while providing a clean outlet into the sump box.
Sump pump box: Automatically moves water to the gray tanks regardless of tank height.
Interior-only plumbing: Improves freeze protection and simplifies maintenance.

These components are being documented here as part of the ongoing evaluation process for the bathroom plumbing system.
Final selections will be made once the shower platform height, tank placement, and plumbing layout are fully defined.