Description
385310076 Duckbill Valve — Single Replacement for Sealand Vacuum Pumps
When your Sealand VacuFlush toilet loses vacuum or cycles constantly, the culprit is almost always a worn duckbill valve. This iFJF 385310076 single replacement duckbill valve is manufactured from premium nitrile rubber and sized for all Sealand S-Series and T-Series vacuum generator pumps. Ideal for boat and RV owners who need to replace one failed valve or build a spare parts kit — without buying a full rebuild kit.
Key Features
-
Premium Nitrile Rubber: Withstands chemical exposure from holding tank treatments and mineral buildup — outlasts generic silicone valves.
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Single Valve Purchase: Buy exactly what you need. No waste, no unused parts.
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OEM-Spec Dimensions: Precise lip geometry ensures complete one-way seal. Drops into S12D, S24D, S32D, T12, T24, T32 without modification.
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Silicone Grease Included: Pre-lubricated for easy installation without tearing.
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Universal S-Series/T-Series Fit: Compatible with all Sealand vacuum generator pumps.
Compatibility
| Series |
Models |
| S-Series |
S12D, S24D, S32D, S115A, S12, 52A, S32 |
| T-Series |
T12, T24, T32 |
| VHT/VG |
VHT12, VHT24, VG4, VG5 |
Specifications
| Spec |
Value |
| Part Number |
385310076 |
| Material |
Premium Nitrile Rubber |
| Valve Type |
One-Way Duckbill Check Valve |
| Quantity |
1 (Single Pack) |
| Includes |
Valve + Silicone Grease Packet |
When to Buy a Single Valve vs. 2-Pack
-
Buy Single: Inlet valve failed but outlet still good. Building a spare parts kit for cruising or camping. Troubleshooting to isolate which valve is the problem.
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Buy 2-Pack: Both valves are original and over 2 years old. Complete pump rebuild recommended. Pump cycles every few minutes.
Symptoms of Failed Duckbill Valves
- Pump runs continuously without building pressure
- Weak or incomplete flushes
- Pump cycles every few minutes without flushing
- Foul odor from vacuum tank area
- Hissing sound near pump during operation
Installation Tips
- Turn off power at breaker. Open pump housing (4-6 screws).
- Note orientation: tapered beak must face toward holding tank.
- Remove old valve carefully. Clean mounting surfaces thoroughly.
- Apply included silicone grease to valve lip and press into place.
- Reassemble housing, restore power, test with 3-4 flushes.
- Check for vacuum hold — pump should not cycle within 2 minutes of idle.
Frequently Asked Questions
Q: How do I identify which valve is bad?
A: Listen near each valve while pump runs. Hissing = leak at that valve. Vacuum bleeds immediately after pump stops = inlet valve failure. Pump slow to build vacuum but holds once achieved = outlet valve issue.
Q: Should I buy one valve or the 2-pack?
A: If both valves are original and over 2 years old, buy the 2-pack for a complete rebuild. If one failed prematurely (chemical damage, debris), a single replacement is sufficient.
Q: How often should duckbill valves be replaced?
A: Every 2-3 years under normal use. Liveaboards and full-time RVers should replace annually. Holding tank chemicals accelerate rubber degradation — inspect valves during annual maintenance.
Q: Will non-OEM valves work as well as original?
A: Our premium nitrile valves match OEM specifications and dimensions. Many marine mechanics report our nitrile compound outlasts OEM rubber in chemically-treated systems.
Q: Can I install this myself?
A: Absolutely. The job takes 15-20 minutes with basic hand tools (screwdriver). No specialized marine or RV knowledge required. Watch our installation video for step-by-step guidance.
Q: What happens if I install it backward?
A: The pump won't build vacuum because the valve will be forced open instead of sealed. The tapered beak MUST face toward the holding tank (away from the vacuum pump). If installed backward, simply flip it around.
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