Would these be suitable to replace washer on hot water bottle screw cap which has started to melt??

If the damaged washer is actually an O-ring with circular Cross Section - Possibly. In addition, the cross-sectional diameter of the ring & the Overall diameter would need to match one of those provided in the kit. If the existing washer is actually a 'washer' i.e., with a rectangular cross-section, then you would be taking a chance.

Will any of these fit on the bosch pressure hose?

As I do not know the dimensions of the Bosch pressure hose, it is not possible to answer this specific question. However, the pack of O-ring gaskets has a good range if sizes (as indicated in the illustration) and I think it is highly likely that there will be a gasket to fit the hose.

It is size for inner or outer please?

They are all different sizes. I just kept swapping them about until I found one that fitted well!

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250 Pcs O-Ring Assortment Kit, NBR Rubber Washers Seals, 15 Sizes Black O Rings with Organizer Box, Oil/Heat Resistant Gasket Set for Plumbing, Automotive, DIY Repair

Product ID: 343476991

Details

Material
Rubber
Nominal inside diameter
0.3
Item diameter
1.9
Brand
ZHENGYYUU
Colour
Black

📦Organizer box for quick access

🔥Heat resistant up to 120°C

🛠️250 pcs versatile kit

12712CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal the deal with confidence—because every fix deserves the perfect fit!

LONG TERM RELIABILITY - High tensile strength and airtight sealing mean fewer replacements and more peace of mind.
EFFORTLESS ORGANIZATION - Transparent, compartmentalized box keeps your O-rings sorted and ready for any emergency fix or project.
UNIVERSAL COMPATIBILITY - Perfect for plumbing, automotive repairs, DIY projects, and industrial applications—your go-to sealing solution.
ALL IN ONE O RING ARSENAL - 250 premium NBR rubber rings in 15 essential sizes—never scramble for the right seal again.
BUILT TO WITHSTAND THE HEAT - Engineered to resist oil, wear, and temperatures up to 120°C, ensuring leak-proof durability under pressure.

This 250-piece O-Ring Assortment Kit features durable nitrile rubber (NBR) washers in 15 commonly used sizes, designed for superior oil and heat resistance up to 120°C. Packaged in a smart organizer box, it offers quick access and reliable sealing for plumbing, automotive, and DIY repairs, making it an essential toolkit upgrade for professionals and enthusiasts alike.

Specifications

ASIN	B095Y3G6WV
Best Sellers Rank	12,152 in DIY & Tools ( See Top 100 in DIY & Tools ) 12 in Tap O-Rings
Brand	ZHENGYYUU
Colour	Black
Country Of Origin	China
Customer Reviews	4.6 out of 5 stars 1,443 Reviews
Item Diameter	1.9 Millimetres
Item diameter	1.9 Millimetres
Manufacturer	ZYGGG
Manufacturer Part Number	ZYGG-250019
Material	Rubber
Model Number	ZYGG-250019
Nominal Inside Diameter	0.3 Centimetres
Nominal Outside Diameter	1.9 Millimetres
Nominal inside diameter	0.3 Centimetres
Nominal outside diameter	1.9 Millimetres
Number of Pieces	250
Set Name	O-Ring Set
Temperature Range	1.2E+2 Degrees Celsius
UPC	719710753181
Unit Count	250 count

Reviews

D**3

Bound to fit

Excellent selection of sizes, handy box-let's hope the catch doesn't fail! (plastic). Great value for money

11.02.2026

T**2

Buy one before you need it

Great box to have around, as when you need it, you'll be glad you've got it. Lots of common sizes and seems like decent quality. Have used a few now and no signs of failure so far.

20.10.2025

A**R

Does the job

17.03.2026

G**D

Value for money.

Great product also saved me a lot of money by repairing my bosh pressure washer like new now.

5.09.2025

S**E

Great value

Very good

6.04.2026

K**H

Okay

15.07.2024

N**L

Good

26.03.2026

T**I

It's Okay

I do like that there are different sizes, unfortunately it has not stopped my tap from dripping

15.12.2025

M**D

Correcte

Dimension manque de clarté

2.04.2024

F**Y

Guarnizioni

Moltissimo utili

17.07.2025

N**O

Jest ok

Uszczelki są spoko. Nie mam zastrzeżeń.

9.11.2025

P**E

Je le recommande

Super boîte à joint

30.08.2025

A**O

good

must have for home plumbing

31.03.2026

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12712CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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

5 days ago

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