RISLONE Heavy Duty Hydraulic Seal Stop Leak & Conditioner - 3.8 Litre 41821
SKU: 56889320620

RISLONE Heavy Duty Hydraulic Seal Stop Leak & Conditioner - 3.8 Litre 41821

Sale price$173.24 Regular price$192.49
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Description

RISLONE Heavy Duty Hydraulic Seal Stop Leak & Conditioner - 3.8 Litre 41821Rislone Hydraulic Seal Stop Leak & Conditioner is designed to keep hydraulic seals soft and pliable and reduce friction and wear in hydraulic systems. Our formula cleans and prevents harmful formation of sludge and varnish while helping keep the hydraulic systems run cooler and last longer. Rislone Hydraulic Seal Stop Leak & Conditioner mixes with all factory approved hydraulic fluids and synthetics. Works on all Petroleum Synthetic Fluid, Pump Seals,


Rislone Hydraulic Seal Stop Leak & Conditioner is designed to keep hydraulic seals soft and pliable and reduce friction and wear in hydraulic systems.  Our formula cleans and prevents harmful formation of sludge and varnish while helping keep the hydraulic systems run cooler and last longer.  Rislone Hydraulic Seal Stop Leak & Conditioner mixes with all factory approved hydraulic fluids and synthetics.  Works on all  Petroleum Synthetic Fluid, Pump Seals, Control Valve Seals, Actuators, Rams, Cylinders, O-ring Boss Hose Fitting, and Hydrostatic Transmission.  This formula is safe to use on Construction, Farm, Manufacturing, Forestry Machinery, Mining, and Marine.

  • Keeps Hydraulic Seals Soft & Pliable
  • Reduces Friction and Wear in Hydraulic Systems
  • Works on all Petroleum Synthetic Fluid, Pump Seals, Hydrostatic Transmission
  • Safe To Use On Construction, Farm, Manufacturing, Forestry Machinery, Mining, & Marine

Dosage & Directions

Mixes with all factory-approved hydraulic fluids and synthetics.

Frequently Asked Questions

Will Rislone Hydraulic Seal work with all regular types of hydraulic fluids?
Yes, Rislone Hydraulic Stop Leak is compatible with all petroleum based, mineral oil, and synthetic fluids. Do not use with water-glycol or phosphate ester flame retardant hydraulic fluids. Do not use in brake fluid systems.

How does Hydraulic Seal work?
After time, hydraulic seals and o-rings tend to dry out and shrink. Rislone revitalizes these seals and o-rings and makes them soft and pliable again

If first application does not completely stop leak, may I add another dosage?
Yes, you can install a second application for hard to stop leaks. If your leak still persists after a second application, then mechanical attention is needed, and replacement of seals may be required.

Can Hydraulic Seal be used for preventative maintenance to help prevent leaks?
Yes, this is a great product to use in older systems to keep them working properly not only to prevent leaks, but keep the system lubricated and protected. The recommended preventative maintenance dose is 15mL per liter of fluid capacity.

How long does it take to start working?
Rislone Hydraulic Seal starts working the minute you install and start using equipment. Most leaks are sealed within a few hours of application and usage. Some leaks can take longer, up to a few days. Old accumulation of fluid on outside of system may drip for a few days after leak has stopped.

My hydraulic system uses motor oil, can I still use Hydraulic Seal?
Yes, Hydraulic Seal will mix and work perfectly in a hydraulic system using motor oil.

Will Hydraulic Seal change the fluid viscosity?
No, we have designed the formulation using a multi-viscosity hydraulic fluid as a carrier which when used at the recommended dosage will not take ISO 22, ISO 32, ISO 46, ISO 68 or ISO 100 out of grade specification.

Will Hydraulic Seal harm painted surfaces?
No, this product will not affect painted surfaces any differently than straight hydraulic fluid.

Will Hydraulic Seal harm hoses?
No, this will not harm or affect hoses in any way.

What is the difference between hydraulic fluid and hydraulic oil?
Nothing, they are the same thing, just a terminology difference.

Technical Information

SAFETY DATA SHEET
CODE: 41821
SIZE: 3.8L

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 56889320620

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Amazon Customer
Fort Morgan, US
★★★★★ 5
Nice quality
Had to return due to our mistake but the mechanic said it was good quality. Ordered the correct size and worked great.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2025
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katelyn traut
Bozeman, US
★★★★★ 5
Perfect fit
Worked great for a 1965 mercury thunderbolt 150hp
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Reviewed in the United States on June 3, 2025
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Lawrence Brown
New York, US
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OEM quality MerCruiser Alpha 1 Gen1 replacement part. Everything you need and some things you don't because it's a universal kit that works for several models.
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Reviewed in the United States on July 19, 2025
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Owen Shirk
West Palm Beach, US
★★★★★ 5
OEM is always the answer
No reason not to go OEM for this! Came with every possible gasket and seal I could need. Specifically for my Alpha One Gen 1 it took maybe 25-30 min to completely install. While you’re there check the base plate for wear and the other surrounding items like your water tube. Rather keep the lower unit off for an extra day to get another part than a catastrophic failure.
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Reviewed in the United States on September 9, 2025
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Taylor 🤍
Natrona Heights, US
★★★★★ 5
Husbands things
My husband bought this. I don’t know much about it but he has zero complaints. He bought it for a boat. He has fixed up 2 boats, sold one & we kept the other. So he apparently knows what to buy & how to use it.
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Reviewed in the United States on November 6, 2025

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