Raised Shower Drain System – Diagram & Flow Path

This diagram illustrates how the raised shower platform, low‑profile drain, 12V sump pump box, and interior gray tanks work together as a complete drainage system.
The goal of this design is to keep all tanks inside the trailer, avoid any under‑floor tank mounting, and ensure reliable drainage even when the gray tanks sit higher than the shower pan.

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System Overview Diagram

                 ┌───────────────────────────────┐
                 │       RAISED SHOWER PAN       │
                 │   (Built on framed platform)  │
                 └──────────────┬────────────────┘
                                │
                                ▼
                 ┌───────────────────────────────┐
                 │  LOW-PROFILE SHOWER DRAIN     │
                 │   (Scandvik 1" Outlet)        │
                 └──────────────┬────────────────┘
                                │ 1" Drain Line
                                ▼
                 ┌───────────────────────────────┐
                 │   12V SHOWER SUMP PUMP BOX    │
                 │   (Zuomeng 750 GPH)           │
                 │ - Collects shower water       │
                 │ - Auto pump activation        │
                 │ - 3/4", 1", 1-1/8" outlets    │
                 └──────────────┬────────────────┘
                                │ Pressurized Output
                                ▼
                 ┌───────────────────────────────┐
                 │     INTERIOR GRAY TANK(S)     │
                 │  (Mounted inside utility bay) │
                 │ - No exterior tanks            │
                 │ - Freeze-protected             │
                 └───────────────────────────────┘

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Flow Path Explanation

The raised shower system works by elevating the shower pan enough to allow a drain line to flow into a compact sump pump box.
The sump pump then automatically transfers water into the interior gray tanks.

• 1. Raised Shower Platform: Provides vertical space for the drain and plumbing beneath the pan.
• 2. Low-Profile Drain: Minimizes height while allowing a 1″ outlet to feed the sump box.
• 3. Sump Pump Box: Collects water and pumps it upward or horizontally to the gray tanks.
• 4. Interior Gray Tanks: Store all wastewater inside the insulated trailer envelope.

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Why This System Works for an Interior-Only Plumbing Layout

This configuration supports the goal of keeping all plumbing and tanks inside the trailer, avoiding exposure to road debris, freezing temperatures, and under‑frame clearance issues.

• No exterior tanks: All tanks remain inside the conditioned space.
• Freeze protection: Interior placement prevents winterization issues.
• Flexible routing: Pumped discharge allows tanks to sit higher than the shower.
• Compact footprint: Marine components are designed for tight spaces.

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Component Placement Diagram (Top‑Down Layout)

 ┌─────────────────────────────── Trailer Bathroom ───────────────────────────────┐
 │                                                                                │
 │   [ Raised Shower ]                                                            │
 │        │                                                                        │
 │        ▼                                                                        │
 │   [ Low-Profile Drain ]                                                         │
 │        │                                                                        │
 │        ▼                                                                        │
 │   [ Sump Pump Box ]  →→→→→→→→→→→→→→→→→→→→→→  [ Interior Gray Tank(s) ]          │
 │                                                                                │
 └────────────────────────────────────────────────────────────────────────────────┘

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Notes for Final Design

• Confirm sump box placement for easy access to the lid and pump.
• Plan for a service hatch or removable panel in the shower platform.
• Use smooth‑bore hose for the pump discharge to reduce backpressure.
• Ensure gray tank inlet height matches the sump pump’s lift capability.

This diagram will serve as a reference as the bathroom plumbing system is finalized and integrated into the overall trailer layout.