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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ACDelco 14047619 GM Original Equipment Cruise Control Vacuum Harness Check Valve

Product ID: 386014968

Details

Brand
GM GENUINE
Exterior Finish
Chrome
Inlet Connection Size
0.25 Inches
Inlet Connection Type
Flange
Item dimensions L x W x H
5.3 x 3.3 x
Material
Brass Steel

⚙️OE-spec precision fit

🛠️Durable brass & stainless steel

🇺🇸Made in USA quality

21131CFA

Duties & taxes included

In stock

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Description

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

COMPACT YET POWERFUL - Small 5.3x3.3x2.3 cm size with high-performance vacuum control
TRUE GM GENUINE PART - Backed by GM for trusted reliability
EFFORTLESS INSTALLATION - No assembly required, plug-and-play convenience
BUILT TO LAST WITH PREMIUM MATERIALS - Robust brass and stainless steel ensure longevity
PRECISION ENGINEERED FOR GM VEHICLES - Seamless OE fit, form, and function guaranteed

The ACDelco 14047619 GM Original Equipment Cruise Control Vacuum Harness Check Valve is a GM-recommended, USA-made replacement part crafted from durable brass and stainless steel. Engineered to meet exact GM OE specifications, it ensures perfect fit and reliable cruise control performance with easy installation and proven longevity.

Specifications

ASIN	B000C982H2
Assembly Required	No
Brand	GM GENUINE PARTS
Country of Origin	USA
Customer Reviews	4.5 4.5 out of 5 stars (393)
Date First Available	7 August 2012
Exterior Finish	Chrome
Global Trade Identification Number	00021625041773
Inlet Connection Size	0.25 Inches
Inlet Connection Type	Flange
Item Dimensions LxWxH	5.3 x 3.3 x 2.3 Centimeters
Item Weight	4.54 g
Item dimensions L x W x H	5.3 x 3.3 x 2.3 Centimeters
Item model number	14047619
Manufacturer	ACDelco
Manufacturer Part Number	14047619
Material	Brass, Stainless Steel
Net Quantity	1.0 Count
Number of Ports	1
OEM Part Number	14047619
Outlet Connection Size	0.25 Inches
Outlet Connection Type	Flare
Product Dimensions	5.33 x 3.3 x 2.29 cm; 4.54 g
Specification Met	OE
UPC	021625041773
Volume	3 Cubic Inches

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