Do i need a male or female coupling to attach this to?

depends on what is on the connecting end of your air hose, typically the hose would have female so the s-690 would need to be male.

Is it metal or aluminum

Aluminum is metal. Brass and aluminum.

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Description

🔧 Inflate with confidence, access with ease—dual heads, double the power!

BUILT TO LAST - Premium solid metal alloy and brass resist corrosion for unmatched durability.
UNIVERSAL FIT - Compatible with cars, trucks, motorcycles, and bicycles using Schrader valves—one chuck to rule them all.
MADE IN THE USA - Crafted with precision and quality control for professional-grade performance.
PRESSURE PERFECT - Handles up to 150 PSI, ensuring reliable inflation for all your tire needs.
DOUBLE THE ACCESS - Dual-head design lets you effortlessly reach inner and outer valve stems—no more awkward angles.

The Dual-Head Air Chuck S-690 is a rugged, brass and metal alloy tire inflator accessory featuring a unique dual-head design for quick access to inner and outer valve stems. Compatible with Schrader valves across vehicles, it supports up to 150 PSI and is proudly made in the USA, ensuring durability and precision for professional and enthusiast use.

Specifications

Thread Size	1/4 inch NPT
Capacity	6.35 Millimeters
Included Components	Air Chuck
Global Trade Identification Number	00030937006905
Manufacturer	Milton Industries
UPC	030937006905
Model	s-690
Product Dimensions	9.75 x 1.75 x 1.3 inches
Item model number	S-690
Is Discontinued By Manufacturer	No
Exterior	Brass
Manufacturer Part Number	S-690
Special Features	DESIGNED/MANUFACTURED: To exacting standards. This is a Closed/Sealing-type air chuck for use on a compressed airline.- DUAL HEAD CHUCK: Makes tire valves more accessible with the two heads for easier access.- INFLATE: By hooking the closed head (w/valve) directly to an airline.- EASY ACCESS: To inner dual when valve is facing inward. Great for reaching into Dually trucks and other challenging angles.- MAX PSI: Maximum air pressure of 150 pounds per square inch. 1/4" female national pipe thread

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