Availability Of Replacement Parts For Nautilus Panel On 2021 Grand Design Momentum 397TH
Updated 12/08/2025 | Published 11/23/2025
Products Featured in This Question
Question:
I have a 2021 Grand Design Momentum 397TH. I believe this is one of the parts I need to replace in my water system. Do you know what the other parts of the Nutalis system are, and do you carry them? Would it be more beneficial to purchase a new panel? THank you
asked by: Michael
Expert Reply:
Hello Michael, thanks for reaching out. The Replacement Dual Diverter Valve Assembly # BM88GR is for the P3 and P4 Panels, so if this is what you have, you can be sure the valve assembly will work.
We carry the complete Nautilus P4 panels like part # BM54GR. We do have a few various replacement parts for them also, so if there is something specific you are looking for just let me know. Depending how many replacement parts you are needing, it might make more sense to just get a whole new panel. Just depends how much of the panel needs to be replaced. Let me know.
(click to enlarge)
Product Page this Question was Asked From
Replacement Dual Diverter Valve Assembly for B&B Nautilus P3/P4 Panels - 1/2" MPT
- Accessories and Parts
- Smart RV
- Diverter Valve
- B and B Molders
more information >
Continue Researching
- Search Results: nautilus p1
- Shop: Replacement Dual Diverter Valve Assembly for B&B Nautilus P3/P4 Panels - 1/2" MPT
- Video: Review of B and B Molders Replacement Dual Diverter Valve Assembly Nautilus P3 P4 - BM88GR
- Q&A: Replacement Ventline Northern Breeze V2525 Vent Cover
- Q&A: Switching Spring Bars of Fastway E2 Kit from 800 lb to 1,000 lb for Trailer with GVWR of 8,200 lb
- Q&A: Can Round Bars on 8K Fastway System be Swapped Out to Make 10K System
- Q&A: Will Solera Replacement Awning Fabric Fit Dometic 9100 Awning
- Q&A: What Country is the Mighty Cord RV Power Cord Adapter Plug Made in?
- Q&A: Does Air Lift Kit # AL88242 Fit 2013 Sunseeker 3010 DS
- Q&A: Replacement Motor for Kwikee Motor Assembly 214-1009
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Most Popular Wheel Bearings
- Article: Best Bike Racks for Electric Bikes
- Article: Trailer Maintenance Schedule
- Article: Our Team Picked The Best Camping Gear of the Year - Here Are Their Top Choices
- Article: How Your RV Water System Works: A Complete Newbie's Guide
- Article: 5 Reasons to Convert Your RV Lights to LEDs Today
Jesse M.
12/8/2025
Hey Michael, how did things go with the Nautilus panel on your Momentum? Did you end up replacing just the diverter valve or decide to go with the full P4 panel instead? Your update could make it easier for others working on the same water system.