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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🔧 Upgrade your plumbing game with precision and power!

WIDE TEMPERATURE RANGE - Operates reliably from -53°C to 121°C (-65°F to 250°F), perfect for diverse industrial environments.
PACK OF TWO FOR EFFICIENCY - Double your installation power with two couplings per pack—ideal for professional projects and quick replacements.
PREMIUM BRASS CONSTRUCTION - Crafted from SAE-grade CA360/CA377 brass, ensuring durability and corrosion resistance beyond ordinary alloys.
BUILT TO WITHSTAND PRESSURE - Engineered for up to 1200psi, outperforming typical fittings to keep your system robust under stress.
PRECISION THREAD COMPATIBILITY - Seamlessly connect mismatched pipe sizes with dual NPT female threads (1/2" & 1/4") for flawless integration.

The Legines Brass Reducing Coupling is a high-quality pipe fitting adapter featuring 1/2" and 1/4" NPT female threads, crafted from SAE-standard CA360/CA377 brass. Rated for pressures up to 1200psi and a wide temperature range (-53°C to 121°C), it ensures durable, reliable connections in demanding plumbing applications. Sold in packs of two, it’s designed for professionals seeking robust, precise pipe size reduction solutions.

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Size	1/2" NPT Female x 1/4" NPT Female
Material	Brass
Brand	Legines
Color	Copper
Item dimensions L x W x H	3.94 x 3.94 x 3.94 inches
Connector Type	Reducer
Thread Size	1/2" and 1/4"
Exterior Finish	Brass
Thread Type	NPT
Number of Pieces	2
Manufacturer	Legines
Part Number	3300*DB
Item Weight	5 ounces
Product Dimensions	3.94 x 3.94 x 3.94 inches
Is Discontinued By Manufacturer	No
Shape	reducing coupling
Item Package Quantity	2
Measurement System	inch
Batteries Included?	No
Batteries Required?	No

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

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