Dometic Macerator Pump Lower Diaphragm Plate Kit - Part# 385311823

DometicSKU: 385311823
Added to catalog: March 11, 2026
Last product update: June 5, 2026 at 6:26 PM

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The Dometic macerator pump lower diaphragm plate kit is an essential replacement component for your RV's waste management system. This kit restores proper pump operation when the lower diaphragm plate becomes worn or damaged, ensuring your macerator pump can effectively break down and discharge black water and gray water from your holding tanks.

Key Features

  • Complete lower diaphragm plate assembly kit for Dometic macerator pumps
  • Restores pump efficiency and waste processing capability
  • OEM Dometic part ensures perfect fit and compatibility
  • Essential replacement when pump output decreases or becomes inconsistent
  • Includes all necessary components for proper installation
  • Extends the life of your macerator pump system

Technical Specifications

Specification Details
Part Number 385311823
Manufacturer Dometic
Component Type Lower Diaphragm Plate Kit
Application Macerator Pump Systems

Frequently Asked Questions

Q: How do I know if my macerator pump's lower diaphragm plate needs replacement?
A: Signs include reduced pumping power, inconsistent waste discharge, unusual grinding noises, or complete pump failure. If your macerator isn't breaking down waste effectively, the diaphragm plate may be worn or cracked.

Q: Is this kit a complete replacement or do I need additional parts?
A: This kit includes the lower diaphragm plate assembly with all necessary components. However, depending on your pump's condition, you may want to inspect other internal components during installation.

Q: Will this part fit my specific Dometic macerator pump model?
A: This is a genuine OEM Dometic part designed for compatible macerator pump systems. We recommend verifying your pump model number before ordering. Our team can help you confirm compatibility—contact us with your RV model and pump details.

Why Choose Elkhart RV Parts

We specialize in hard-to-find Dometic replacement parts for RV owners who need genuine OEM components. Shipping directly from Elkhart, Indiana—the RV capital of the world—we maintain inventory of essential macerator pump parts and other Dometic systems. Our expert team provides support to help you identify the exact part your RV needs, ensuring proper fit and reliable performance on the road.

100% Authentic OEM Parts

Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.

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