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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Corp 36663 Toilet Seal Lube & Conditioner

Product ID: 340515168

Details

Brand
Thetford
Item form
Liquid
Number of Items
1
Specific uses for product
RV/Marine
Unit count
24 Milliliters

🚐Universal RV & marine compatibility

⚙️Prevents waste buildup for smooth operation

🛡️Silicone-based, petroleum-free seal protection

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$U6668

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚽 Keep your RV throne leak-free and smooth — because your adventures deserve the best!

DUAL USE CONVENIENCE - Perfect for both toilet seals and holding tank seals, simplifying maintenance routines.
TRUSTED BY THOUSANDS - Highly rated with 4.6 stars from over 4,400 users who swear by its effectiveness.
ALL IN ONE SEAL SAVIOR - Works seamlessly with all permanent and portable RV & boat toilets for ultimate versatility.
LONG LASTING SEAL PROTECTION - Silicone-based, petroleum-free formula that extends seal life and prevents deterioration.
SMOOTH LEAK FREE PERFORMANCE - Penetrates seals to prevent waste sticking and stops leaks, ensuring flawless toilet function.

Thetford Corp 36663 Toilet Seal Lube & Conditioner is a premium silicone-based, petroleum-free lubricant designed for all RV and marine toilets. It penetrates and conditions seals to prevent waste buildup and leaks, extending seal life and ensuring smooth, reliable toilet operation. Trusted by thousands, it’s the go-to solution for maintaining portable and permanent toilet seals in recreational vehicles and boats.

Specifications

ASIN	B002NSU0ZW
Best Sellers Rank	#48,844 in Automotive ( See Top 100 in Automotive ) #3 in RV Toilet Additives
Brand	Thetford
Brand Name	Thetford
Container Type	Bottle
Contains Liquid Contents?	Yes
Customer Reviews	4.6 out of 5 stars 4,459 Reviews
Global Trade Identification Number	00028985366638
Item Form	Liquid
Item Weight	1.65 Pounds
Item form	Liquid
Item weight	1.65 Pounds
Manufacturer	Thetford
Model Number	36663
Number of Items	1
Part Number	36663
Recommended Uses For Product	Marine
Specific Uses For Product	RV/Marine
Specific uses for product	RV/Marine
UPC	028985366638
Unit Count	24 Milliliters
Unit count	24 Milliliters

Reviews

R**S

Toilet valve lubricat

This should stop the seal perishing over the winter when not in use

18.10.2024

R**E

Best out there, really works!

Wow!!! This stuff is amazing! The toilet kept leaking water out of the bowl which made the camper stink. Used this once and it sealed it up!! Will be buying more!

6.05.2026

T**T

Rejuvenated old seal

Can use sparingly. No need to dump a bucket in. Just cover the seal. Rejuvenated 20yr old seal in trailer. Seals great again and slides nice.

1.10.2025

R**T

Great Product

Works great

26.04.2026

D**V

It works pretty well

Shipped fast worked good

3.12.2025

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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$U6668

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Uruguay.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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2 months ago

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