Rule 98B 800 GPH Shower Drain System - 12V DC Automatic Pump with Back Flow Prevention

The Rule 98B Shower Drain System is a complete automatic pump-and-box unit designed to clear grey water from boat shower and sink drains, keeping bilge areas and living spaces free of nuisance water. Rated at 800 GPH nominal flow, the system pairs a high-capacity 12V DC pump with a sealed polycarbonate shower box that resists unwanted water splash while remaining fully serviceable without special tools. A back flow prevention feature reduces the amount of water that can siphon back into the shower box, protecting against re-flooding once the pump shuts off. The unit uses a fast fix mounting system and threaded port fittings for straightforward installation, and it is built to Rule's testing standards for automatic operation in demanding marine environments. This makes the Rule 98B suitable for boat owners replacing a worn-out shower or sink drain pump, or for new shower/sink drain installations where reliable, hands-off water removal is required. The pump draws 2.9 amps at 12V (3.5 amps at 13.6V) and is protected by a 5 amp fuse, with a 3/4 inch discharge hose connection for compatibility with standard marine hose. The system measures 10.24 inches long by 9.5 inches wide by 5.5 inches high and is constructed of durable plastic components.

Specifications

• Brand: Rule
• Manufacturer Part Number: 98B
• Nominal Flow Rate: 800 GPH
• Voltage: 12 VDC
• Amp Draw: 2.9 Amps at 12V, 3.5 Amps at 13.6V
• Recommended Fuse Size: 5 Amp
• Discharge Hose Diameter: 3/4 inch
• Material: Plastic
• Lid Type: Sealed polycarbonate lid
• Color: Clear or Neutral
• Dimensions: 10.24 inches L x 9.5 inches W x 5.5 inches H
• Weight: 3.2 pounds
• Back Flow Prevention: Yes

Frequently Asked Questions

What is the flow rate of the Rule 98B Shower Drain System? The Rule 98B has a nominal flow rate of 800 GPH, providing high-capacity removal of shower and sink grey water.

What voltage does this shower drain system use? The Rule 98B operates on 12 VDC, drawing 2.9 amps at 12V and 3.5 amps at 13.6V.

What fuse size is recommended for the Rule 98B? A 5 amp fuse is recommended for the Rule 98B Shower Drain System.

Does the Rule 98B include back flow prevention? Yes, the Rule 98B Shower Drain System is equipped with back flow prevention to reduce water siphoning back into the shower box.

What size discharge hose does the Rule 98B use? The Rule 98B has a 3/4 inch discharge hose diameter.

What material is the Rule 98B shower box made from? The Rule 98B shower box lid is a sealed polycarbonate lid, with the overall unit constructed of plastic components.

What color is the Rule 98B Shower Drain System? The Rule 98B is available in a clear or neutral color.

How much does the Rule 98B weigh? The Rule 98B Shower Drain System weighs 3.2 pounds.

What are the dimensions of the Rule 98B? The Rule 98B measures 10.24 inches long by 9.5 inches wide by 5.5 inches high.

Is the Rule 98B easy to install? Yes, the Rule 98B uses a fast fix mounting system with threaded port fittings for simple installation.

Can the Rule 98B be serviced without special tools? Yes, the Rule 98B shower box has a clip-on lid designed to be fully serviceable without the need for any tools.

Is the Rule 98B fully automatic? Yes, the Rule 98B Shower Drain System is designed for fully automatic operation.