How many check valves am I getting for $ 4.33

You get one check valve. I thought it was 5 by the picture but when I bought it I only got the one.

what is the diameters for inlet & outlet? thanks.

Does anyone know why the diameter of those 2 ports are different from 1/4 black end?

Can they be used on a boostefd engine and if so how much boost?

Kevin, I need a little more info. What engine do you have and where are you considering mounting these check valves? Please tell me the engine size, number of cylinders, if you mean turbo boost, or other kind of boost system, and definitely if used for racing.

What are the dimensions of the ports ?

The item I purchased (not what’s in the photo) was designed for internal hose (tube) diameter of 3/16”.

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🛠️ Upgrade your ride with GM’s precision valve—because your vehicle deserves genuine excellence.

BUILT TO LAST - Crafted from high-grade nylon with a machined finish, ensuring long-lasting durability under all driving conditions.
COMPACT LIGHTWEIGHT - At just 0.634 ounces and 2.7 x 1.4 x 1 inches, it’s a space-saving powerhouse that fits discreetly yet performs boldly.
EFFORTLESS INSTALLATION - Compression inlet and NPT outlet connections designed for quick, secure setup—get back on the road faster.
SEAMLESS OEM COMPATIBILITY - Engineered to GM OE specs for perfect fit, form, and function—no guesswork, just flawless performance.
TRUSTED GM RECOMMENDED PART - Backed by GM’s rigorous standards, this valve guarantees reliability and peace of mind for your vehicle’s HVAC system.

The GM Genuine Parts 15-50568 Vacuum Check Valve is a GM-recommended replacement part manufactured to original equipment specifications. Made from durable nylon with a machined finish, it ensures reliable HVAC system performance and easy installation with compression and NPT connections. Compact and lightweight, this valve delivers trusted GM quality and longevity for your vehicle.

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Material	Nylon
Brand	GM Genuine Parts
Item dimensions L x W x H	2.7 x 1.4 x 1 inches
Exterior Finish	Machined
Inlet Connection Type	Compression
Outlet Connection Type	NPT
Number of Ports	1
Outlet Connection Size	0.25 Inches
Global Trade Identification Number	00707773122037
Manufacturer	ACDelco
UPC	707773122037
Model	Check Valve
Item Weight	0.634 ounces
Product Dimensions	2.7 x 1.4 x 1 inches
Item model number	15-50568
Manufacturer Part Number	15-50568
OEM Part Number	15733271

GM Genuine Parts15-50568 (15733271) Vacuum Check Valve

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