Rule 98B Marine Shower Drain Box – 800 GPH, 12V
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Rule 98B Marine Shower Drain Box – 800 GPH, 12V
The Rule 98B Shower Drain Box is a self-contained 12V marine shower sump system rated at 800 GPH. It combines a friction-fit pump and automatic switch inside a compact drain box housing, making it a complete drop-in solution for marine shower drain installations. The polycarbonate snap lid cover is gasketed for a watertight seal and allows quick access for inspection and cleaning.
Multiple mounting options, pre-marked cut guides, and drill points simplify installation, and the included port fitting assortment covers the most common hose sizes. A joker valve prevents backflow, and an easy-clean strainer keeps debris out of the pump.
Compatible Applications
- Marine shower sump and drain installations
- Freshwater and saltwater vessel shower systems
- 12V DC marine electrical systems
- Hose sizes: 3/4", 1", and 1-1/8" (straight and 90° elbow fittings included)
Key Features
- SKU: 29-98B | Rule P/N: 98B
- Flow rate: 800 GPH
- Voltage: 12V DC
- Friction-fit pump and automatic switch — no tools required for removal
- Polycarbonate snap lid cover with gasket — watertight seal
- Multiple mounting options with pre-marked cut guides and drill points
- Threaded port fittings: 3/4", 1", 1-1/8" straight and 90° elbow combinations included
- Easy-clean strainer — traps debris before the pump
- Joker valve — prevents backflow
- UPC: 042237106551
Related Products
- Johnson Pump Viking Power 16 Waste Water / Bilge Pump – 12V
- Johnson Pump Multi-Port Shower Sump Pump
Parts Desk Insights
The Rule 98B is a strong choice for new shower drain installations where you want a complete, self-contained system rather than sourcing a pump, switch, and housing separately. The 800 GPH rating handles typical marine shower flow rates comfortably, and the friction-fit pump design means the pump can be pulled for service or replacement without tools. The included fitting assortment — 3/4", 1", and 1-1/8" in both straight and 90° elbow configurations — covers most existing hose layouts without additional adapters. If your installation requires multiple drain inlets (shower plus sink or condensation), the Johnson Pump Multi-Port Shower Sump is worth comparing.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.