I guess i should have been more specific. the clamp on the valve body. i am aware of the hose clamps. some photos show it with a clamp, others do not.

make sure you use all clamps or it will separate

Does this restrict the raw water flow in any way?

It doesn’t seem to restrict water flow. But I’ve got to warn you, I’ve had two of these crack and fail (see my review and picture).

Is it necessary to close the seacock when flushing your engine when on a trailer? Also, this comes with the entire kit right?

No, you don't have to close the seacock as there is an internal check valve. And yes, it comes with what you see which is the flushing adapter and two hose clamps. You will have to attach your garden hose to the white piece which protrudes from the side which if the hose if very deep in your bilge can be a problem. I found a short 4 ft hose extension which I attached and now I can easily grab that from outside the boat standing on the trailer. One suggestion is to, after cutting out a section of the engine's suction line so that the adapter will fit, apply some dish soap to both the inside of the hose as well as the outside of the barbed adapter. This will make getting it to go into the hose a lot easier. (Don't forget to slide the hose clamps onto the hose first!

If you turn on the hose with a lot of pressure won't all of this pressure then go into the engine/water pump/hoses etc?

I wouldn’t use full water pressure. My review and picture show’s the true design flaw in this plastic valve, don’t waste your money like I did three times!

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Perko 0456DP7 Flush Pro Engine Flushing and Winterizing Valve, 1 1/4"

Product ID: 6911747

Details

Brand
Perko
Exterior Finish
Stainless
Inlet Connection Size
1.25 Inches
Inlet Connection Type
Female Iron
Item dimensions L x W x H
3 x 9 x 12
Material
Polymer Steel

💧1.25" universal hose fit

⚙️automatic fresh water flush

❄️winterizing made effortless

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S$212

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Description

💦 Flush smarter, winter easier—your boat’s new best friend!

UNIVERSAL 1 25 FIT - Seamlessly integrates with standard marine hoses for instant compatibility.
WINTERIZE LIKE A PRO - Simplify your off-season prep with a valve designed to make winterizing quick and reliable.
MULTI USE COMPATIBILITY - Perfect for inboard engines and onboard generators—one valve, multiple solutions.
EFFORTLESS FRESHWATER FLUSH - Connect your garden hose and let the valve do the work—no complicated setup needed.
DURABLE STAINLESS STEEL POLYMER BUILD - Engineered to withstand harsh marine environments and last season after season.

The Perko 0456DP7 Flush Pro Valve is a universal 1.25" marine flushing valve that automates freshwater circulation through inboard engines and onboard generators. Built with durable stainless steel and polymer, it simplifies engine flushing and winterizing by connecting directly to a garden hose, ensuring hassle-free maintenance and long-lasting performance.

Specifications

ASIN	B00144D86Y
Best Sellers Rank	#118,977 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #62 in Boat Engine Motor Flushers
Brand Name	Perko
Connector Type	Physical Connector
Customer Reviews	4.4 4.4 out of 5 stars (128)
Exterior Finish	Stainless Steel
Global Trade Identification Number	00085226343414
Included Components	Perko 0456DP7 Flush Pro Engine Flushing and Winterizing Valve, 1 1/4"
Inlet Connection Size	1.25 Inches
Inlet Connection Type	Female Iron Pipe
Item Dimensions	3 x 9 x 12 inches
Item Type Name	Perko 0456DP7 Flush Pro Engine Flushing and Winterizing Valve, 1 1/4"
Item Weight	2 Grams
Manufacturer	PERKO
Manufacturer Part Number	0456DP7
Manufacturer Warranty Description	Warranty
Material Type	Polymer, Stainless Steel
Model Number	0456DP7
Outlet Connection Size	1.25 Inches
Outlet Connection Type	1-1/4 inch connection
Set Name	Flush Pro Valve
Size	1 1/4"
Specification Met	Meets Relevant Industry Specifications for Marine Valves
Thread Size	1-1/4"
Thread Type	NPT
UPC	085226343414
Unit Count	1.0 Count
Valve Type	Flush Valve

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