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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EZ-FLO 20401LF Brass In-Line Check Valve

EZ-FLO 20401LF Brass In-Line Check Valve

Product ID: 334239522

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Details

Material
Brass Steel
Brand
Eastman
Item dimensions L x W x H
46 x 32 x 32
Exterior Finish
Brass
Inlet Connection Size
0.5 Inches
Inlet Connection Type
Flange

💧5 PSI minimum to open, 200 PSI max pressure

🔩1/2 inch IPS threaded inlet/outlet

🛡️Solid brass body for durability

Description

🚰 Lock in flawless flow—no backflow, no drama!

BUILT TO LAST - Robust brass construction paired with a stainless steel spring ensures longevity and corrosion resistance.
COMPACT POWERHOUSE - Small footprint (4.57 x 3.18 x 3.18 cm) packs a punch in performance without taking up space.
SEAMLESS COMPATIBILITY - Standard 1/2 inch IPS threading fits effortlessly into your existing plumbing setup.
MAINTENANCE FREE RELIABILITY - Engineered for hassle-free operation, so you can focus on bigger projects without backflow worries.
PRESSURE PERFECT PERFORMANCE - Opens at a low 5 PSI and withstands up to 200 PSI, ideal for demanding irrigation and pump systems.

The EZ-FLO 20401LF Brass In-Line Check Valve is a compact, durable plumbing essential designed to prevent fluid backflow in irrigation and water systems. Featuring 1/2 inch IPS threaded connections, a solid brass body, and a stainless steel spring, it operates reliably from 5 PSI up to 200 PSI. Maintenance-free and NSF/ANSI certified, this valve ensures smooth, efficient water flow for both residential and commercial applications.

Specifications

Material	Brass, Stainless Steel
Brand	Eastman
Item dimensions L x W x H	46 x 32 x 32 Millimeters
Exterior Finish	Brass
Inlet Connection Size	0.5 Inches
Inlet Connection Type	Flange
Outlet Connection Type	Flange
Maximum Operating Pressure	2E+2 Pound per Square Inch
Number of Ports	2
Outlet Connection Size	0.5 Inches
Specification Met	NSF, ANSI
Global Trade Identification Number	00091712423294
Manufacturer	EZ-FLO
UPC	091712423294
Country of Origin	USA
Item model number	20401LF
Product Dimensions	4.57 x 3.18 x 3.18 cm; 120 g
ASIN	B00GZ3GZT6

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