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,

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Eastman 20401LF Line Check Valve, Brass, 1/2-In

Eastman 20401LF Line Check Valve, Brass, 1/2-In

Product ID: 321606676

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Details

Material
Stainless
Brand
Eastman
Item dimensions L x W x H
46 x 32 x 32
Exterior finish
Stainless
Inlet connection size
0.5 inches
Inlet connection type
Threaded

💧Prevents water backflow

🔩1/2 inch FIP threaded connection

🛠️Heavy-duty brass build

Description

💧 Secure your flow, upgrade your plumbing game!

BUILT TO LAST - Crafted from robust brass for unmatched durability and strength in every plumbing project.
UNIVERSAL FIT - 1/2 inch female iron pipe threaded connection ensures seamless compatibility with standard hoses.
PRESSURE READY - Operates reliably under pressures up to 200 PSI, opening at just 5 PSI for optimal performance.
BACKFLOW BLOCKER - Engineered to stop water from reversing flow, protecting your system effortlessly.
SAFE COMPLIANT - Meets Safe Drinking Water Act standards, guaranteeing safety and peace of mind.

The Eastman 20401LF Line Check Valve is a compact, heavy-duty brass valve designed to prevent water backflow. Featuring a 1/2 inch female iron pipe threaded connection, it fits most standard hoses and withstands working pressures up to 200 PSI. Lightweight at 120g and compliant with the Safe Drinking Water Act, it’s a reliable, professional-grade solution for efficient plumbing systems.

Specifications

Manufacturer	EZ-FLO
Part Number	20401LF
Product Dimensions	4.57 x 3.18 x 3.18 cm; 120 g
Item model number	20401LF
Size	1/2-In
Colour	Brass
Style	1/2 inch FIP x 1/2 inch FIP
Material	Stainless Steel Brass
Item Package Quantity	1
Maximum Pressure	2E+2 Pound per Square Inch
Measurement System	inch
Included Components	valve
Batteries included?	No
Batteries Required?	No
Item Weight	120 g

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