Es para uso horizontal o vertical?

In-line check valves can be installed horizontally or vertically.

What is the threading if i wanted to attach brass connectors to either side?

Thank you for your question on the Brass In-Line. The threading is 1/2" FIP.

Will this work with oil?

Can't say for sure, but I would say it depends on things like whether the oil is clean and how hot the oil is. I would think that it would work with clean, ambient temperature oil, but that does not take into account what the seals are made of and what kind of oil you're talking about. Some oils will degrade the seals. Not much help, but something to think about.

Max water temp and is the spring inside stainless steel?

In the industrial world, low temp is 180f or less, High temp is 181- Steam, so when someone says low temp, you can use this idem. I personally have used them on my boiler returns without a problem, just make sure you at 5ft of head for your circulator pump,

Ez Flo 20405lf Brass In Line Check Valve

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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€ 61.55

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

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Description

🚰 Stop Backflow, Start Flowing: The Brass Valve That Means Business

SAFE SOUND - NSF and ANSI certified, fully compliant with the Safe Drinking Water Act for worry-free water safety.
BUILT TO LAST - Crafted from premium heavy-duty brass for unmatched durability and strength in every use.
PLUG PLAY FIT - Standard 1/2 inch female iron pipe (FIP) threading guarantees compatibility with most hoses and plumbing setups.
BACKFLOW BLOCKER - Engineered with a stainless steel spring to ensure water flows only forward—no more unwanted backflow.
PRESSURE PERFECT - Operates seamlessly between 5 PSI minimum to open and withstands up to 200 PSI maximum pressure.

The EZ-FLO 20401LF Brass In-Line Check Valve is a compact, maintenance-free plumbing essential designed to prevent water backflow. Constructed from heavy-duty brass with a stainless steel spring, it supports pressures up to 200 PSI and fits standard 1/2 inch FIP connections. Certified safe for drinking water, it’s the reliable choice for professionals and DIYers aiming for durable, compliant water flow control.

Specifications

ASIN	B00GZ3H3JW
Brand	Eastman
Brand Name	Eastman
Connector Type	Threaded
Customer Reviews	4.6 out of 5 stars 819 Reviews
Exterior Finish	Brass, Stainless Steel
Exterior finish	Brass , Stainless Steel
Global Trade Identification Number	00091712423355
Included Components	valve
Inlet Connection Size	1 Inches
Inlet Connection Type	Female Iron Pipe
Inlet connection size	1 Inches
Inlet connection type	Female Iron Pipe
Item Dimensions	18 x 36 x 38 millimeters
Item Type Name	Brass In-Line Check Valve
Item dimensions L x W x H	18 x 36 x 38 millimeters
Manufacturer	EZ-FLO
Manufacturer Part Number	20405LF
Material	Brass
Material Type	Brass
Maximum Pressure	200 Pound per Square Inch
Model Number	20405LF
Number of Ports	2
Outlet Connection Size	1 Inches
Outlet Connection Type	FIP
Size	1 in.
Smart Home Compatibility	Not Smart Home Compatible
Specification Met	NSF, ANSI
Thread Type	FIP
UPC	091712423355
Unit Count	1 Count
Valve Type	check valve

Reviews

J**T

Recommended but do NOT freeze them!

These work very well but do NOT freeze them or they will leak.

7.11.2025

A**O

es un buen producto

Nosotros lo usamos regularmente y nos da buen resultado, tenemos mucho tiempo utilizando

23.06.2025

D**A

Solid, Well-Made, and Works Exactly as Expected

Solid, Well-Made, and Works Exactly as Expected This check valve is high quality and easy to install. The brass feels durable, the threading is clean, and it sealed perfectly with no leaks. Once installed, it did exactly what it’s supposed to do — prevented backflow and kept everything running smoothly in my RV’s water system. If you need a reliable in-line check valve, this one is definitely worth it.

5.12.2025

C**N

Bonne qualité

Parfait !

17.05.2025

J**A

Fácil instalación

Se ve de buena calidad, espero que duré mucho

15.07.2023

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€ 61.55

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

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The product quality is outstanding. Exactly what I needed for my work.

1 month ago