Can this be installed in a vertical position?

I can tell you what happens when this is installed vertically, the lid cracks and sewage leaks all over the basement floor! My plumber installed it vertically when my house was built 1.5 years ago. It only took 2 guests staying in the basement for the lid to crack.

I have a drain in my backyard which i tie my drain into this sometimes backs up can this be used for this purpose.How much pressure to open it up ?

I think it will work although there is no gasket, unless specs have changed since my installation! There could be some leakage. It takes very little pressure to open!

Is there a neoprene or other seal on the flapper to provide a positive seal?

See http://www.canplasplumbing.com/plumbing.aspx?categoryID=385 -(put in whole http address)- and you will find their backwater valves and a replacement flapper. It is made out of ABS and has a neoprene ring just like the flapper in the valve.. The screw on top - access plug -also has a neoprene ring.

Canplas 73009 Backwater Valve with 4-Inch PVC, White

Canplas 73009 Backwater Valve with 4-Inch PVC, White

Product ID: 255639346

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Details

Brand
Canplas
Exterior finish
White
Inlet connection size
4 Inches
Item dimensions L x W x H
24.8 x 17.1 x
Material
Polyvinyl

💧Neoprene O-ring leak seal

⚙️Durable Acme threaded socket design

🛡️Reliable backflow protection

Description

🛠️ Secure your flow, protect your home—because backups are so last season!

BUILT TO LAST - Acme threaded sockets deliver superior traction and strength for long-term durability.
LEAK PROOF SEAL - Neoprene O-ring ensures a watertight closure, eliminating worries about leaks.
CERTIFIED QUALITY - Meets ASSE standards, guaranteeing trusted performance and peace of mind.
EFFORTLESS INSTALLATION - Compact, lightweight design with socket x socket DWV fittings for a seamless fit.
ULTIMATE BACKFLOW DEFENSE - Prevents sewage and stormwater backflow to protect your home’s plumbing integrity.

The Canplas 73009 Backwater Valve is a compact, lightweight 4-inch PVC valve designed to prevent sewage and stormwater backflow. Featuring durable Acme threaded sockets and a neoprene O-ring for a reliable, leak-proof seal, it meets ASSE certification standards for trusted plumbing protection.

Specifications

ASIN	B002KKVET4
ASIN	B002KKVET4
Batteries Included?	No
Batteries Required?	No
Color	White
Date First Available	5 May 2013
Date First Available	5 May 2013
Included components	223284W
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	13.6 g
Item model number	223284W
Item model number	223284W
Manufacturer	Canplas
Manufacturer	Canplas
Material	Polyvinyl Chloride
Measurement System	inch
Number Of Pieces	1
Part number	223284W
Product Dimensions	24.77 x 17.15 x 16.51 cm; 13.61 g
Product Dimensions	24.77 x 17.15 x 16.51 cm; 13.61 g
Size	6.5 x 6.75 x 9.75 inches
Specification met	ASSE

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