Xylem’s Rule Shower Drain Pump System: installation, servicing & cleaning improvements
Xylem’s Rule Shower Drain Pump System model 98B is the next-generation marine shower drain solution from Xylem’s Rule brand, redesigned from the ground up to address the real-world challenges boaters face when installing, servicing, and cleaning shower drain systems in tight spaces. This page provides a full product overview video and written summary comparing the 98B model to its predecessor, the 98A model, so you can understand exactly what changed and why.
What's new in the Rule Shower Drain Pump System model 98B
After 25 years with the same core design, the Rule Shower Drain Pump System has been fully updated. Here is a breakdown of every key improvement in the 98B model over the 98A model.
Threaded port fittings
The 98A used smooth, stepped port fittings. The 98B features fully threaded port fittings compatible with 3/4 in. (19 mm) and 1-1/8 in. (29 mm) hose, as well as elbow fittings. Each port includes a built-in cut guide and a center drill point to simplify hose sizing and drilling during installation.
Flexible mounting options
In addition to the standard mounting rails, the 98B includes a mounting foot accessory. This allows installers to anchor the unit from the front or sides without the rails – a practical option in tighter or unconventional bilge configurations.
Snap-fit lid
The 98A lid was secured with four screws, making access difficult in cramped bilge spaces. The 98B replaces this with a snap-fit lid that pops off and snaps back on without tools. A new gasket around the lid perimeter prevents water from splashing out while the vessel is underway.
Slide-out strainer
Removing and cleaning the strainer basket is one of the most frequent maintenance tasks. The 98B strainer slides straight out for debris removal and slides back in with no fumbling required.
Tool-free float switch removal
The 98A float switch required removing two screws for extraction. The 98B float switch is secured by two side tabs and pops free with finger pressure alone.
Easier pump removal
Like the float switch, pump removal has been simplified to a friction-fit release. The pump slides out cleanly without tools.
Larger joker valve for better flow
The 98B uses a significantly larger joker valve than the 98A, which increases discharge flow capacity and reduces the risk of blockages.
Quick reassembly
All components, including the check valve, pump, float switch, and lid, reassemble quickly without fasteners. The updated lid with the Rule logo fits in either orientation, reducing the chance of incorrect installation.
Key benefits at a glance
- Easier installation – threaded port fittings, integrated drill guides, and flexible mounting options reduce install time
- Easier servicing – tool-free access to the lid, float switch, and pump means faster maintenance in the bilge
- Easier cleaning – the slide-out strainer makes routine debris removal simple, even in confined spaces
- Better performance – a larger joker valve delivers improved flow compared to the previous model
Frequently Asked Questions
The 98B introduces threaded port fittings (vs. smooth/stepped on the 98A), a snap-fit lid (vs. four-screw), a slide-out strainer, tool-free float switch and pump removal, and a larger joker valve for greater flow. Every change makes for easier installation, servicing, and cleaning.
The threaded port fittings on the 98B are compatible with 3/4 in. (19 mm) and 1-1/8 in. (29 mm) hose, as well as elbow fittings.
Yes. Each 98B package includes a mounting foot accessory as an alternative to the standard mounting rails, offering more flexibility in bilge installations.
Contact Xylem directly for compatibility guidance specific to your vessel's existing plumbing and mounting setup.