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 — GM precision in every mile!

PRECISION FITMENT - Designed with exact inlet/outlet sizes (0.25 inches) and connection types (socket weld & flare) for seamless installation.
BACKED BY GM LEGACY - Genuine GM part with continuous design updates, guaranteeing cutting-edge technology and durability.
OEM GRADE RELIABILITY - Engineered and validated by GM engineers for flawless integration with Chevrolet, Buick, GMC, and Cadillac vehicles.
CRUISE CONTROL ESSENTIAL - Critical vacuum check valve that maintains optimal ignition and fuel management system performance.
DURABLE METAL CONSTRUCTION - Machined metal finish ensures long-lasting performance under rigorous engine conditions.

The GM Genuine 14047619 Cruise Control Vacuum Harness Check Valve is a compact, metal vacuum check valve engineered by GM to meet OE standards. Designed specifically for Chevrolet, Buick, GMC, and Cadillac vehicles, it ensures reliable cruise control and engine fuel management performance with precise inlet/outlet connections and a durable machined finish.

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Material	Metal
Brand	GM
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
Valve Type	vacuum check valve
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 Parts Genuine 14047619 Cruise Control Vacuum Harness Check Valve

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