SKU: 51747809627

4" Double Door UL/FM Wafer Check Valve

Sale price$114.62 Regular price$127.36
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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18

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Description

4" Double Door UL/FM Wafer Check ValveThe 4" Double Door UL FM Wafer Check Valve is a high performance, compact check valve designed for backflow prevention in fire protection, HVAC, and industrial piping systems. Featuring a dual plate (double door) design, this valve provides low pressure drop, quick closure, and reliable flow control. UL listed and FM approved, it meets industry standards for fire protection and commercial applications. Specification Details TYPE Double Door Wafer

The 4" Double Door UL/FM Wafer Check Valve is a high-performance, compact check valve designed for backflow prevention in fire protection, HVAC, and industrial piping systems. Featuring a dual-plate (double-door) design, this valve provides low-pressure drop, quick closure, and reliable flow control. UL-listed and FM-approved, it meets industry standards for fire protection and commercial applications.

Specification Details
TYPE Double Door Wafer Check Valve
DESIGN Double-Door (Dual-Plate) Design, Ensures efficient backflow prevention with minimal pressure
MATERIAL Ductile Iron Provides high durability, strength, and corrosion resistance
WEIGHT (LBS)
ADDITIONAL INFORMATION 3.66" Length, 6-3/4" OD
BODY MATERIAL Ductile Iron
Disc Material Stainless Steel AISI 316
FINISH Fusion Bonded Epoxy Coated
NOMINAL SIZE 4"
OPENING SIZE 5.35"
PRESSURE RATING 300 psi
SEAL MATERIAL  PTFE
SEAT MATERIAL  EPDM
TEMPERATURE RATING 32 to 212 °F
APPLICATIONS

Ideal for Fire Protection Systems, HVAC & Mechanical Piping, Water Distribution & Plumbing, Industrial & Process Control, Irrigation & Water Treatment

BRAND Midland Industries

 

Link to Midland Industries Catalog

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 51747809627

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4.6 ★★★★★
Based on 17 reviews
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Miguel Quezada
Dallas, US
★★★★★ 5
Great price
Great product
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Reviewed in the United States on May 23, 2026
A
Verified Purchase
Alan C
San Leandro, US
★★★★★ 5
Give me a try I don’t think it’ll let you down
This has to be the best oil I ever used. I noticed the difference as soon as I put the oil in and started the engine.! I will continue to use this oil for as long as I own, the vehicle and any future cars I may own or drive! I read 75% of the reviews before purchasing this oil . The only thing I’ve noticed. Anyone who gave it below a five star was because they received used motor oil.. in my opinion I think it was returned after somebody filled it up with their used motor oil and returning it for their money back somehow Amazon put it back on the shelf for resale. So take it for what it’s worth but it’s really great oil.
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Reviewed in the United States on March 24, 2026
M
Verified Purchase
miguel vazquez
Chelsea, US
★★★★★ 5
Great oil
Won’t use another brand now that I’ve used these guys. Phenomenal brand, noticeable difference in the engine.
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Reviewed in the United States on April 2, 2026
C
Verified Purchase
Carlos G
Chelsea, US
★★★★★ 5
Recommended
Excellent quality, a synthetic mixture that I will no longer use another brand for my car. I removed a little noise that I had
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Reviewed in the United States on December 30, 2025
B
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beachboy
New York, US
★★★★★ 5
Buy it !
I run this in our 2010 PT Cruiser Classic, you can hear the difference, pricey but worth it, will buy again.
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Reviewed in the United States on May 9, 2026

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