Can this item be used on a pressure washer with 3100psi ?

I would say this fitting would not be appropriate as the description does say it is good for operating pressures of up to 1200psi. There may be a brass version made heavier for use at higher pressure, or perhaps one made of stainless steel instead of brass. I am using it at very low pressure in a computer water cooling loop to adapt thread sizes where a smaller and lighter fitting was preferable for me. I would search for a fitting that states it is good for a 3100psi working pressure or higher, or you are taking a risk of serious injury should this fitting burst.

Which size fits a Schrader valve?

A Shrader valve is: 0.305" in OD, thread root diameter 0.302" in x 32 tpi (threads per inch). A Shrader valve is not a NPT thread. Try B09QMCF6BK.

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NPT Reducing Coupling Brass 1/4" Female x 1/8" Female, Hex Reducer Coupler Adapter Pipe Fitting 1200psi (Pack of 2)

NPT Reducing Coupling Brass 1/4" Female x 1/8" Female, Hex Reducer Coupler Adapter Pipe Fitting 1200psi (Pack of 2)

Product ID: 128235579

Details

Brand
Legines
Colour
Copper
Connector type
Coupling
Exterior finish
Brass
Item dimensions L x W x H
10 x 10 x 10
Material
Brass

🔩1200psi max pressure

🧰Durable CA360/CA377 brass alloy

🛠️Dual NPT female threads 1/4" x 1/8"

NPT Reducing Coupling Brass 1/4" Female x 1/8" Female, Hex Reducer Coupler Adapter Pipe Fitting 1200psi (Pack of 2)

Product ID: 128235579

Details

Brand
Legines
Colour
Copper
Connector type
Coupling
Exterior finish
Brass
Item dimensions L x W x H
10 x 10 x 10
Material
Brass

🔩1200psi max pressure

🧰Durable CA360/CA377 brass alloy

🛠️Dual NPT female threads 1/4" x 1/8"

S$32

Duties & taxes included

In stock

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Description

🔧 Connect with confidence — the brass standard in reducing couplings!

PRECISION FIT - Dual female NPT threads (1/4" x 1/8") ensure leak-tight connections
TEMPERATURE TOUGH - Operates flawlessly from -53°C to 121°C (-65°F to 250°F)
PREMIUM BRASS BUILD - Crafted from SAE-standard CA360/CA377 brass for superior corrosion resistance
PRO GRADE COMPATIBILITY - Ideal for diverse piping systems needing secure size reduction
PRESSURE READY PERFORMANCE - Handles up to 1200psi for industrial-grade reliability

The Legines NPT Reducing Coupling is a high-performance brass pipe fitting featuring dual female NPT threads (1/4" and 1/8") designed for secure, leak-resistant connections. Made from premium CA360/CA377 brass alloy, it withstands pressures up to 1200psi and temperatures ranging from -53°C to 121°C, making it ideal for demanding industrial and plumbing applications. Sold in packs of two, this hex reducer coupler ensures durability and precision in pipe size transitions.

Specifications

ASIN	B07486QJKK
Brand	Legines
Colour	Copper
Connector Type	Coupling
Customer Reviews	4.6 4.6 out of 5 stars (459)
Exterior Finish	Brass
Item Dimensions	10 x 10 x 10 centimetres
Manufacturer	Legines
Material	Brass
Model Number	3300*BA
Number of Pieces	2
Part Number	3300*BA
Size	1/4" NPT Female x 1/8" NPT Female
Thread Size	1/4
Thread Type	NPT
Unit Count	2.0 count

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