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 flow game with brass precision and unmatched durability!

COMPACT DUAL PACK - Two couplings per pack for versatile, cost-effective plumbing upgrades
PRECISION NPT THREADS - Ensures leak-proof, secure connections for your critical pipe systems
WIDE TEMPERATURE RANGE - Operates flawlessly from freezing cold to high heat (-65°F to 250°F)
HIGH PRESSURE TOLERANCE - Rated for 1200 PSI to handle demanding industrial and residential applications
DURABLE BRASS CONSTRUCTION - Corrosion-resistant and ductile for long-lasting performance under stress

The Legines NPT Reducing Coupling is a high-quality brass pipe fitting featuring female National Pipe Taper threads sized 1/2" x 1/4" for connecting different diameter male pipes. Engineered for durability, it withstands pressures up to 1200 PSI and temperatures from -65°F to 250°F, making it ideal for diverse plumbing and industrial uses. Sold in packs of two, this corrosion-resistant coupling ensures secure, leak-proof connections with a compact design.

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Size	1/2" NPT Female x 1/4" NPT Female
Material	Brass, Stainless Steel
Brand	Legines
Colour	Copper
Item dimensions L x W x H	10 x 10 x 10 Centimeters
Connector Type	Reducer
Thread Size	1/2
Exterior Finish	Brass
Thread Type	NPT
Number of Pieces	2
Manufacturer	Legines
Item part number	3300*DB
Product Dimensions	10 x 10 x 10 cm; 141 g
ASIN	B07487LP8X

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

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