I question whether 6 ounces is needed to lube the seal. It seems that pouring in just enough to completely cover the bottom of the bowl would lube it.

I'm sorry to say this stuff was garbage. It was easier to just go buy a new seal than to waste the $ on this. Didn't even work a little bit.

do i pour in while the toilet has water in it or should the seal be dry?

Pour in with no water. Make sure valve is closed. Pour about a 1/4 of container if I remember correctly and leave overnight. Fixed my seal. Hasn't leaked since

Can it be used with valve lube or is this the same thing

The two products are compatible with one another and serve two different purposes. Toilet seal works in the bowl to keep the flush valve functioning . Valve lube goes straight into the blackwater (poo) tank and ALSO in the greywater (sink&shower) tank to prevent problems with the seals that keep the drain valves operational. I use both as preventive maintenance.

Does this work for the seal on cassette toilets?

This is not a sealant. It is simply advertised as a lubricant for sliding toilet parts. If you're using it as such....it should work

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RV Toilet Seal Lube and Conditioner - Toilet Seal Lubricant - 24 oz - Thetford 36663

Product ID: 11222443

Details

Brand
Thetford
Item Form
Liquid
Specific Uses For Product
RV/Marine
Surface Recommendation
Toilet
Unit Count
24.0 Fluid

⚙️24 oz long-lasting lubricant

🛡️Petroleum-free silicone formula

🛥️Universal RV & marine compatibility

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882659₫

Duties & taxes included

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Thetford
Item Form
Liquid
Specific Uses For Product
RV/Marine

Description

🚐 Keep your RV throne flawless—because smooth seals mean smooth travels!

VERSATILE VOYAGER - Works seamlessly with all permanent and portable RV & boat toilets
SAFE SOUND FORMULA - Petroleum-free, silicone-based to extend seal life without damage
SEAL THE DEAL SMOOTHLY - Penetrates and conditions seals for flawless toilet operation
SEASON READY PROTECTION - Ideal for year-round use including winterization
WASTE WONT STICK AROUND - Prevents buildup to keep your toilet fresh and hassle-free

Thetford's 24 oz RV Toilet Seal Lube & Conditioner is a petroleum-free, silicone-based lubricant designed to penetrate and protect toilet and holding tank seals in RVs and boats. Compatible with all permanent and portable toilets, it prevents waste buildup, ensures smooth operation, and extends seal life, making it essential for hassle-free travel and seasonal maintenance.

Specifications

ASIN	B002NSU0ZW
Brand	Thetford
Brand Name	Thetford
Container Type	Bottle
Contains Liquid Contents?	Yes
Customer Reviews	4.6 out of 5 stars 4,675 Reviews
Global Trade Identification Number	00028985366638
Included Components	Toilet Seal Lubricant & Conditioner - 24 oz. bottle
Item Form	Liquid
Item Type Name	Toilet Seal Lubricant & Conditioner - 24 oz. - Thetford 36663
Item Weight	1.7 Pounds
Manufacturer	Thetford
Model Number	36663
Number of Items	1
Part Number	36663
Recommended Uses For Product	Marine
Size	24 Fl Oz (Pack of 1)
Specific Uses For Product	RV/Marine
Surface Recommendation	Toilet
UPC	028985366638
Unit Count	24.0 Fluid Ounces

Reviews

W**R

7.02.2026

D**N

17.03.2026

D**N

16.12.2025

K**R

12.01.2026

R**T

26.04.2026

C**E

29.03.2026

A**R

30.03.2026

M**.

29.01.2026

R**S

18.10.2024

T**T

1.10.2025

D**V

3.12.2025

M**E

3.03.2026

S**N

26.08.2024

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