RV Toilet Seal 3" Socket Floor Flange Kit for Dometic 300 310
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Enter appliance or equipment model number to verify compatibility with this part
Replaces Part Numbers
RV Toilet Seal 3" Socket Floor Flange Kit for Dometic 300 310
Key Features
- Designed for Dometic 300, 310, and 320 RV toilets.
- Includes a 3-inch socket floor flange, base seal gasket, and flush ball seal.
- Rubber seals help create a secure connection around the toilet base to reduce water leakage and block unpleasant odors.
- The flange is made from ABS plastic, while the toilet seals are made from rubber for wear and corrosion resistance.
- The flange has a “THIS SIDE DOWN” marking to help identify the correct installation orientation.
- Package contents: 1 RV toilet flange, 1 base seal gasket, 1 flush ball seal, 2 bolt caps, 2 fixing bolts, 2 fixing nuts, 2 nut spacers, 4 screws, and 4 expansion screws.
- Lifetime protection covers product defects or issues.
Replaces / Cross-Reference Part Numbers
- 385345892 — 3-inch socket floor flange
- 385311658 — flush ball seal
- 385311652 — base seal
Compatibility & Fitment
This kit fits Dometic 300, 310, and 320 RV toilets with a matching 3-inch socket floor flange connection. Compare the existing flange, seal shape, and drainpipe size with the product details before ordering to confirm the correct match.
When to Replace
- Replace the flange or seals when water leaks around the toilet base.
- A worn flush ball seal can allow odors to enter the RV or prevent the toilet from sealing properly.
- Cracked, deformed, hardened, or corroded components should be replaced during a toilet base repair.
- Replacing the seals and flange together can restore the connection when the existing components no longer provide a secure seal.
Installation Tips
- Remove the old flange and seals, then clean the toilet base and surrounding mounting area before installation.
- Position the new flange with the “THIS SIDE DOWN” marking oriented correctly.
- Install the base seal and flush ball seal in their matching locations, then secure the toilet with the included bolts, nuts, spacers, screws, and expansion screws as applicable.
- Confirm that the flange, seals, and drainpipe align before tightening the hardware.
- Check the toilet base for leaks and verify the seal after installation.
KEEP YOUR RV READY FOR ADVENTURE
BlueStars helps you maintain your RV with reliable replacement solutions.
Compatible Models
Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering
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Brand
BlueStars
Manufacturer
BlueStars
Part Number
3 inch
Model
RV Toilet Seal with 3 Inch Socket Floor Flange Kit
Package Dimensions
8.43 x 7.36 x 3.11 inches
Item Weight
1.01 pounds
FAQs
Suggestions
Common Model Number Locations
Need help finding your model number? Select your appliance or lawn equipment below for location diagrams
- Above the refrigerant valves on the back of the air conditioner
- On the side of the unit near the run capacitor or electrical lines that go into your home
- On either side of the exterior
- On the back of the unit where the power cord is located
- In the cool air exhaust port
- To the left of the fan opening, on the weather barrier
- Below the control panel
- On either side of the exterior
- Behind the front grill on the frame
- On the door frame
- On the inside of the tub wall
- Behind the control panel
- On the door
- Inside the edge of the unit
- On the back exterior
- On the door
- On the side of hose storage
- Inside the edge of the unit
- On inside of the door
- On the door frame
- On the back exterior of the unit
- On the exterior side of the unit
- Behind the control panel
- On the inside of the door
- On the door frame
- On the exterior side of the unit
- At the top of the unit
- On the inside of the dryer door
- On the door frame
- Under the washer lid
- On either side of the exterior
- On the back exterior of the unit
- On the door frame
- On the exterior side of the unit
- On interior wall
- On the control panel
- On side of door
- On the right-hand side of the vent, under the control panel
- On the interior wall of the microwave (microwave model number only)
- On the door frame
- On the rear panel
- On the exterior back of the unit
- Inside the top part of the vent duct (in down-draft models)
- Underneath a burner
- Underneath a knob
- Underneath the cooktop (lift-up style)
- Bottom of cooktop
- On an exterior wall
- On an inside wall
- On the door frame
- On the right-hand side of the vent, under the control panel
- On the interior wall of the microwave (microwave model number only)
- On the door frame
- On the rear panel
- Behind the control panel
- Under the front surface unit
- On the door frame
- Interior side panel
- On the exterior of the unit
- On the inside of the lower storage compartment wall
- On top the hood
- Behind the filter
- Under the hood
- On the inside of the door
- On the exterior back of the unit
- Inside on the rear wall
- On the exterior side of the unit
- On door jamb
- On rear of frame
- Behind front panel
- On ceiling of refrigerator
- On interior wall
- On the inside of the door
- Behind crisper drawer
- Behind kickplate
- On ceiling of refrigerator
- On interior wall
- On door frame
- Behind crisper drawer
- Behind kickplate
- On ceiling of freezer
- On interior wall
- On the inside of the door
- Behind kickplate
- On the exterior side of the unit
- On inside of the door
- On the door frame
- On the back exterior of the unit
- On the front exterior of the unit
- On the control panel
- Inside the lid
- Under the lid on the frame
- On the exterior of the unit
- At the top of the unit
- On the inside of the dryer door
- On the door frame
- Under the washer lid
- On either side of the exterior
- On the top center of heater
- On the exterior of the unit
- On the starter housing
- On the side of the housing, behind the top handle
- On the side of the motor housing
- Near the rear grip
- On the top or sides of the engine housing
- On the gas tank
- On the recoil housing
- On the handle bars
- On top of the engine cover
- Near discharge chute, often behind chute flaps
- On rear of the deck, behind the engine
- Dash panel
- Back of mower/rear bumper
- Underside of the seat
- Lower side of hood, near engine
- Frame (beneath the seat, footrest)
- Mower deck
- Underside of the seat
- Frame beneath or near the seat
- Back of mower/rear bumper
- Lower left side between gas tank and mower deck
- Under the foot plate
- On the rear of the blower
- Inside of vacuum canister
- Side of the motor housing
- On the rear base of the vacuum
- On the bottom of the belly of the vacuum
- On the frame near the engine
- On the side of the auger housing
- On the lower rear of the snow blower between wheels
- On the side of the motor housing
- On the shaft
Select an appliance to see where its model number is located.
