What Hose Can be Used to Drain Gray Water RV Tank
Updated 12/17/2025 | Published 11/19/2024
Products Featured in This Question
Question:
Does anyone make a 1-1/2 ID slinky style hose for draining gray tank? Thank you
asked by: Dan S
Expert Reply:
Hey Dan,
The vast majority of the time the gray tank empties into the 3" black water sewage so nobody has a slinky-style 1-1/2" diameter sewage hose.
For your setup you can use either the threaded Valterra # T01-0094VP or the bayonet-style Camco # CAM39463, which reduces the 1-1/2" opening to the size of a garden hose (like the Dometic # W01-4180) and has a threaded connection for that as well. Since the gray water tank only holds used water and doesn't include waste, you can have this much smaller diameter hose to empty just that tank.
Product Page this Question was Asked From
Valterra Gray Water Drain Connector - 1-1/2" FPT to 3/4" Hose Thread
- RV Sewer Hose Fittings
- Sewer Drain Traps and Connectors
- Drain Connectors
- FPT
- MPT
- 1-1/2 Inch Diameter
- 3/4 Inch Diameter
- Valterra
more information >
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on RV Sewer Hose Fittings
Lazer S.
12/15/2025
Hey Dan, did the Valterra or Camco connector end up working for your gray tank drain? Knowing what setup you went with could help others trying to downsize from a 1-1/2 inch hose. Your update could make it easier for the next person with the same issue.