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
- Shop: Replacement Dual Diverter Valve Assembly for B&B Nautilus P3/P4 Panels - 1/2" MPT
- Search Results: nautilus replacement parts
- Video: Review of B and B Molders Replacement Dual Diverter Valve Assembly Nautilus P3 P4 - BM88GR
- Shop: B&B Nautilus P4 RV Water Control Panel - 12-1/2" Tall x 11-1/2" Wide - Polar White
- Shop: Replacement Diverter Valve Assembly for B&B Nautilus P4 Panel - 1/2" MPT
- Shop: Replacement Diverter Valve for B&B RV Water Centers - 1/2" MPT Connections
- Shop: Replacement 3-Way Diverter Valve Assembly for B&B Nautilus P1/P2.5 Panels - 1/2" MPT
- Video: Let’s Check Out the Replacement Diverter Valve Assembly for B and B Nautilus P4 Panel
- Video: An inside look at the multifunction control panel
- Video: Complete Breakdown of the B and B Nautilus P4 RV Water Control Panel
- Shop: Replacement 2-Way Diverter Valve Assembly for B&B RV Nautilus P1/P3 Panels - 1/2" MPT
- Shop: B&B End Cap with Step for RV - Left Hand - 1-3/16" - Black
- Search Results: nautilus p1
- Video: All About the B and B RV Fresh Water Fill Diverter Valve and Plate Assembly
- Video: Feature Review Replacement Mini Diverter Handle for B and B RV Nautilus Panels
- Video: Complete Breakdown of the MORryde Safe-T-Rail Telescoping RV Hand Rail
- Shop: Trailer Hitch
- Search Results: rv air conditioners
- Shop: Trailer Wiring
- Search Results: suspension enhancement
- Shop: Suspension Enhancement
- Search Results: e track
- Search Results: air bag compressor kit
- Shop: Gooseneck Hitch
- Shop: Fifth Wheel Hitch
- Search Results: nautilus p4
- Shop: Floor Mats
- Shop: Vehicle Seat Covers
- Q&A: Replacement parts for Diverter Valve for B&B RV Water Centers - 1/2" MPT Connections
- Q&A: Replacement Parts for RV Fresh Water Fill Diverter Valve
on Accessories and Parts
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.