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

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

Product ID: 86245606

Details

Brand
Legines
Color
Copper
Connector Type
Reducer
Exterior Finish
Brass
Item dimensions L x W x H
3.94 x 3.94 x
Material
Brass

🔩1200psi max pressure

⚙️Dual NPT female threads 1/2" & 1/4"

🛠️Premium CA360/CA377 brass SAE standard

R390

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Description

🔧 Connect with Confidence — The Ultimate Brass Reducer for Pros

PACK OF TWO - Double your installation power with two high-quality couplings
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 durability
PRESSURE READY PERFORMANCE - Handles up to 1200psi for industrial-grade reliability
PRECISION THREAD COMPATIBILITY - Seamlessly connects 1/2" and 1/4" NPT male pipes with dryseal threads

The Legines Brass Reducing Coupling is a high-performance pipe fitting designed to connect 1/2" and 1/4" NPT male threaded pipes. Made from premium CA360/CA377 brass meeting SAE standards, it supports pressures up to 1200psi and operates across a wide temperature range (-53°C to 121°C). Sold in packs of two, this hex reducer features dryseal threads for leak-resistant connections, ideal for demanding industrial and scientific applications (not for potable water use).

Specifications

ASIN	B07487LP8X
Best Sellers Rank	#19,954 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #552 in Pipe Fittings
Brand Name	Legines
Color	Copper
Connector Type	Reducer
Customer Reviews	4.6 4.6 out of 5 stars (466)
Exterior Finish	Brass
Item Dimensions	3.94 x 3.94 x 3.94 inches
Manufacturer	Legines
Manufacturer Part Number	3300*DB
Material Type	Brass
Number of Pieces	2
Size	1/2" NPT Female x 1/4" NPT Female
Thread Size	1/2" and 1/4"
Thread Type	NPT
Unit Count	2.0 Count

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