Any danger of backflow into the RO system if the Ptrap is clogged?

I would assume it depends on how high up into the pipe you place it. You can put a check valve in line with the drain to prevent this. Most RO’s come with an inline check valve but you can add one if you would like. The back-flow pressure of the drain valve is stronger than the drain pipe in the sink so it should prevent backup.

Will it fit a 2in drain pipe? It's said 40-50mm, and 50mm is slightly less than 2in. So want to make sure

If you use the little sponge square that is supplied with it , it should

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SDTC Tech 1-Pack Drain Saddle Valve with 1/4" Quick Connect Plastic Water Filters Valve Clamp for Reverse Osmosis System

SDTC Tech 1-Pack Drain Saddle Valve with 1/4" Quick Connect Plastic Water Filters Valve Clamp for Reverse Osmosis System

Product ID: 741858345

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Details

Material
Plastic
Brand
SDTC Tech
Exterior Finish
Plastic
Inlet Connection Size
0.25 Inches
Inlet Connection Type
Compression
Outlet Connection Type
Flange

🔗1/4" quick connect fitting

⚙️3.0MPa pressure resistance

🛠️POM material durability

Description

💧 Connect with confidence — the last valve your RO system will ever need!

DURABLE POM CONSTRUCTION - Crafted from abrasion and impact-resistant POM plastic for long-lasting, aging-resistant use.
EFFORTLESS QUICK CONNECT - Snap on or off with the 1/4" quick connect fitting for hassle-free installation and maintenance.
COMPLETE INSTALLATION KIT - Includes bolts, nuts, and clamps for a secure, leak-proof setup right out of the box.
BUILT TO WITHSTAND PRESSURE - Engineered to resist up to 3.0MPa without leaks, ensuring reliable performance under high water pressure.
UNIVERSAL FIT FOR RO SYSTEMS - Designed to fit 40-50mm OD pipes, perfect for under-counter reverse osmosis water filtration setups.

The SDTC Tech 1-Pack Drain Saddle Valve features a 1/4" quick connect fitting designed for reverse osmosis systems, made from durable POM plastic that resists abrasion, impact, and aging. It fits 40-50mm outer diameter pipes and withstands pressures up to 3.0MPa without leakage. The package includes all necessary hardware for easy, secure installation, making it an essential upgrade for efficient and reliable water filtration drainage.

Specifications

Material	Plastic
Brand	SDTC Tech
Exterior Finish	Plastic
Inlet Connection Size	0.25 Inches
Inlet Connection Type	Compression
Outlet Connection Type	Flange
Maximum Operating Pressure	3E+3 Pascal
Number of Ports	2
Outlet Connection Size	0.25 Inches
Specification Met	ANSI B1.20.1, ANSI B16.11, ASSE, NSF, UPC, WQA
Manufacturer	sdtc
UPC	779303535754
Country of Origin	USA
Item model number	779303535754
Package Dimensions	11 x 9.91 x 3.2 cm; 50 g
ASIN	B08GSQK7K1

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