What size (outside diameter) are the two fittings?

Thanks for asking.. They are for 1/4

Which way is this valve installed? I understand one way allows the vacuum to be pulled through and one flows freely but dont know which way to install

This device is a one way check valve used to permit vacuum to be applied to a vacuum storage tank. Think of vacuum as the opposite of air pressure and you will understand. The way to tell which way to install it is to put your mouth on one side and see if you can blow through it. If you can that is the direction that the vacuum will pass. The other way you can do it is to put your lips on one side and see if you can suck and get air to come through. If you can that is the side that should be connected to the vacuum generation device such as the intake manifold of your automobile.

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🚗 Cruise with Confidence: The Genuine GM Vacuum Valve You Can’t Afford to Miss!

COMPACT EFFICIENT - Small footprint (2.1 x 1.3 x 0.9 inches) fits seamlessly into your vehicle’s cruise control vacuum system without hassle.
FUTURE READY DESIGN - Regularly updated by GM to incorporate the latest materials and technology, keeping your vehicle running at peak efficiency.
OEM GRADE RELIABILITY - Designed and validated by GM engineers for flawless integration with Chevrolet, Buick, GMC, and Cadillac vehicles.
SEAMLESS CONNECTIVITY - Features 0.25-inch inlet and outlet connections with socket weld and flare types for secure, leak-free installation.
PRECISION MACHINED METAL - Durable metal construction with a sleek machined finish ensures long-lasting performance under all driving conditions.

The GM Genuine Parts 14047619 Cruise Control Vacuum Harness Check Valve is a precision-engineered, metal OE component designed specifically for GM vehicles. It ensures reliable cruise control performance with a compact design, secure connections, and durability backed by rigorous GM testing and continuous innovation.

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Material	Metal
Brand	GM Genuine Parts
Item dimensions L x W x H	2.1 x 1.3 x 0.9 inches
Exterior Finish	Machined
Inlet Connection Size	0.25 Inches
Inlet Connection Type	Socket Weld
Outlet Connection Type	Flare
Number of Ports	1
Outlet Connection Size	0.25 Inches
Specification Met	oe
Global Trade Identification Number	00021625041773
Manufacturer	ACDelco
UPC	021625041773
Model	ACDelco - Cruise Control (Slp) (14047619)
Item Weight	0.16 ounces
Product Dimensions	2.1 x 1.3 x 0.9 inches
Item model number	14047619
Manufacturer Part Number	14047619
OEM Part Number	14047619

GM Genuine Parts14047619 Cruise Control Vacuum Harness Check Valve

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