Radwell, Large
JAN
4978955003031
ASIN
Maker
Model No.
MH303
Color
Size
Description
Holts Radweld 250ml MH303 Product Description
The ultra-fine fiber and resin contained in the formula seal holes. Only the exposed portion hardens, allowing residual components inside the radiator to circulate without clogging. It's a permanent repair, remaining effective even after a coolant change. Applying it as a preventative measure beforehand is a safe and secure solution.
Capacity/Size: 75 x 40 x 145
Caution (Disclaimer) > Please Read
Caution (Disclaimer) Must Read
▪️Compatibility Verification
Compatibility of auto parts varies depending on the year and model, so please confirm compatibility in advance.
The model year listed on your vehicle inspection certificate is the year the vehicle was newly registered and does not necessarily correspond to the year of manufacture.
We do not guarantee the data on the product page, so we appreciate your cooperation.
We will ship your order as ordered. If you have not confirmed this, we will not accept returns or exchanges, even if the product is not suitable.
▪️Shipping Method
We will ship via courier or Yu-Packet.
▪️About the Item
Please inspect the item promptly upon arrival.
If the wrong item was delivered due to our error, or if the item is defective upon delivery, we will resend a replacement item.
If we are unable to provide an equivalent item due to a missing item, we will provide a refund if we are unable to do so.
Please note that under any circumstances, we cannot compensate for any labor costs incurred during product exchange or any associated damages.
Defects or damage due to incorrect installation, or modifications to the product during installation, are not eligible for exchange or return.
▪️Other
Product images are for illustrative purposes only.
If the product contents change, we may cancel your order. Brand Name: Holts. Seals holes in radiators and prevents leaks. The ultra-fine fiber and resin contained in the formula seals holes. Only the part exposed to the air hardens, allowing residual components inside the radiator to circulate without clogging. Simply inject the formula into the radiator to easily repair leaks. If you apply it in advance, it will instantly stop leaks immediately after they occur. It's a permanent repair, so it won't leak even if you change the coolant again.
▪️One bottle for radiator capacity (up to 20L) *Addition rate is within 3% (maximum of 2 bottles can be used)
▪️Use one bottle for large vehicles such as buses and trucks
▪️Shake the container well and stir thoroughly before pouring
▪️After pouring, start the engine and warm the coolant to circulate
▪️Stop the engine and allow the radiator to cool sufficiently before working
▪️Cannot be used with Super Coolant
▪️Cannot be used with Toyota Century, imported cars, cars with cooling systems equipped with filtration devices, or Honda dual-carb cars
▪️Cannot be used with cars with clogged cooling water passages due to rust, or cars with filters in the water circulation passages
▪️Not effective on holes or cracks larger than 1mm
▪️Cannot repair leaks from all holes and cracks
▪️If the inside of the radiator (coolant) is dirty, be sure to use a radiator cleaner (Holtz Speed Flash MH304 or Clean the inside of the engine with a MH317 cleaner to remove limescale, mud, and rust, then add fresh coolant. If the cleaner doesn't remove the dirt, discontinue use. Keep an eye on the coolant level until the leak stops. Capacity/Size: 75 x 40 x 145mm. 4978955003031 Radweld Large (text created at , 2025-05-11)
The ultra-fine fiber and resin contained in the formula seal holes. Only the exposed portion hardens, allowing residual components inside the radiator to circulate without clogging. It's a permanent repair, remaining effective even after a coolant change. Applying it as a preventative measure beforehand is a safe and secure solution.
Capacity/Size: 75 x 40 x 145
Caution (Disclaimer) > Please Read
Caution (Disclaimer) Must Read
▪️Compatibility Verification
Compatibility of auto parts varies depending on the year and model, so please confirm compatibility in advance.
The model year listed on your vehicle inspection certificate is the year the vehicle was newly registered and does not necessarily correspond to the year of manufacture.
We do not guarantee the data on the product page, so we appreciate your cooperation.
We will ship your order as ordered. If you have not confirmed this, we will not accept returns or exchanges, even if the product is not suitable.
▪️Shipping Method
We will ship via courier or Yu-Packet.
▪️About the Item
Please inspect the item promptly upon arrival.
If the wrong item was delivered due to our error, or if the item is defective upon delivery, we will resend a replacement item.
If we are unable to provide an equivalent item due to a missing item, we will provide a refund if we are unable to do so.
Please note that under any circumstances, we cannot compensate for any labor costs incurred during product exchange or any associated damages.
Defects or damage due to incorrect installation, or modifications to the product during installation, are not eligible for exchange or return.
▪️Other
Product images are for illustrative purposes only.
If the product contents change, we may cancel your order. Brand Name: Holts. Seals holes in radiators and prevents leaks. The ultra-fine fiber and resin contained in the formula seals holes. Only the part exposed to the air hardens, allowing residual components inside the radiator to circulate without clogging. Simply inject the formula into the radiator to easily repair leaks. If you apply it in advance, it will instantly stop leaks immediately after they occur. It's a permanent repair, so it won't leak even if you change the coolant again.
▪️One bottle for radiator capacity (up to 20L) *Addition rate is within 3% (maximum of 2 bottles can be used)
▪️Use one bottle for large vehicles such as buses and trucks
▪️Shake the container well and stir thoroughly before pouring
▪️After pouring, start the engine and warm the coolant to circulate
▪️Stop the engine and allow the radiator to cool sufficiently before working
▪️Cannot be used with Super Coolant
▪️Cannot be used with Toyota Century, imported cars, cars with cooling systems equipped with filtration devices, or Honda dual-carb cars
▪️Cannot be used with cars with clogged cooling water passages due to rust, or cars with filters in the water circulation passages
▪️Not effective on holes or cracks larger than 1mm
▪️Cannot repair leaks from all holes and cracks
▪️If the inside of the radiator (coolant) is dirty, be sure to use a radiator cleaner (Holtz Speed Flash MH304 or Clean the inside of the engine with a MH317 cleaner to remove limescale, mud, and rust, then add fresh coolant. If the cleaner doesn't remove the dirt, discontinue use. Keep an eye on the coolant level until the leak stops. Capacity/Size: 75 x 40 x 145mm. 4978955003031 Radweld Large (text created at , 2025-05-11)
Package
Size (Approx.):
Size (Approx.):
79x38x144 mm
Package
Weight (Approx.):
Weight (Approx.):
280 g
2,078 JPY (Including Tax)
Stock :
13
Scheduled Shipping:
2026-07-15
Quantity :
Reference Price from Other Stores
