How to Connect the B&B RV Water Center BM32GR to a Black Water Tank
Updated 08/13/2026 | Published 08/07/2026
Products Featured in This Question
Question:
BandB RV Water Center - City/Tank Fill - Ventless - Tank Flush - Shower - 2 Coax What is involved with hooking up the black water tank flush. My old unit doesn’t have one. Where do I connect the line to the black tank? Thanks
asked by: Bill U
Expert Reply:
Hey Bill. The 1/2" MPT tank flush port on the back of the B&B RV Water Center item # BM32GR is going to connect to your black water holding tank's built-in rinse nozzle. The water center uses 1/2" PEX pipe to connect to the black tank.
If your black tank doesn't have a built-in rinse nozzle, you can use the Replacement Flusher Sprayer item # BM33GR to add one. You'll also need the B&B RV Vacuum Breaker item # BM93GR to prevent wastewater backflow from the black tank from contaminating the city water inlet inlet on the Water Center item # BM32GR. You would then just need to source the 1/2" PEX pipe and the 1/2" MPT male and female fittings from a local hardware store.
What kind of RV do you have? Feel free to answer this and throw in any other questions you have, where it says Add Comment.
(click to enlarge)
(click to enlarge)
Product Page this Question was Asked From
B&B RV Water Center - City/Tank Fill - Ventless - Tank Flush - Shower - 2 Coax
- RV Water Inlets
- City Water Inlet
- Recessed Mount
- 11-1/16W x 6T Inch Cutout
- 3-3/4 Inch Deep
- Plastic
- 13W x 7-3/4T Inch Flange
- Black
- B and B Molders
more information >
Continue Researching
- Shop: B&B RV Water Center - City/Tank Fill - Ventless - Tank Flush - Shower - 2 Coax
- Shop: B&B RV Vacuum Breaker - Check Valve - Black
- Video: The Low-Down on the Replacement Flusher Sprayer for B and B Molders Tank Flusher Systems
- Shop: Replacement Flusher Sprayer for B&B Molders Tank Flusher Systems
- Shop: B&B Mini RV Water Center - City/Tank Fill - Winterize/Sanitize - Shower - Pump Switch
- Shop: B&B Mini RV Water Center - City - Tank Fill/Winterize - Tank Flush - Pump Switch
- Video: Review of B and B Molders RV Water Inlets - City Fill Inlet - BM32GR
- Search Results: alpha systems
- Search Results: black tank flush
- Video: Comprehensive Review: B and B RV Vacuum Breaker
- Shop: Alpha Systems N2100 Alphaseal All Purpose Sealant for RVs - Clear - 10.3 oz - Qty 1
- Shop: SpeedStrap HD 3-Point Spare Tire Tie-Down w/ Swivel Hooks for 36" - 48" Tires - 2"
- Article: Trailer Wiring Diagrams
- Search Results: trailer hitch
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Shop: Trailer Hitch
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Search Results: trailer tires and wheels
- Shop: Trailer Wiring
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Shop: Suspension Enhancement
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Video: How to Choose a Trailer Brake Controller
- Search Results: trailer wiring
- Article: How to Measure for Trailer Hitch Drop
- Q&A: Does etrailer Carry Furrion Chill Cube w/ Heat Pump to Replace Dometic Duo-Therm
- Shop: Brake Controller
- Search Results: trailer jack
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Video: An In-Depth Look at the Roadmaster Battery Charge Line Kit for Towed Vehicles
on RV Water Inlets
Bill U.
8/11/2026
Thank you. That is what I was hoping I could do. Also thanks for the part list. Bill.