Waterless Trap Seal 1.5 in - Compact Waterless Drain Seal

In this review of the Waterless Trap Seal 1.5 in, the bottom line is simple: it is a practical, eco-friendly drain insert for homeowners and plumbers who need reliable odor control without a standing water trap. The reviewer found the model best where pipes measure 37-45 mm in diameter and where a low-profile, easy-to-install solution is preferred. Its modest height, 1.5 in connection and 8 GPM flow rate make it an accessible retrofit for bathroom sinks and similar drains, and the overall impression is that it solves smell problems while being affordable and durable.

Key Features

• Fit range: Designed for pipes measuring 37-45 mm, it adapts to a variety of common drain sizes for retrofit work.
• Low profile: The 28 mm height provides a compact fit that works in confined spaces and many sink drain assemblies.
• Flow capacity: The 8 GPM flow rate keeps routine drainage functional while maintaining the waterless seal benefit.
• Simple installation: Requires recessing 2-4 in into the drain and seating the silicone skirt with a screwdriver for a secure fit.
• Eco-friendly design: Built by a company with multiple patents focused on water conservation and reduced waste technologies.
• Cost effective: Affordability and straightforward performance make it a practical pick for new builds and upgrades.

Who It's For

The Waterless Trap Seal 1.5 in is best for homeowners, maintenance workers and tradespeople replacing poorly performing or smelly drain traps in bathroom sinks and similar fixtures, especially when a low-profile, waterless solution is wanted. It also suits retrofit projects where pipe inner diameters fall within the stated 37-45 mm range and a quick, tool-assisted installation is acceptable.

Those who should look elsewhere include users with drain pipes outside the fit range or installations that demand faster free-flow drainage under heavy use, since some customers note slower drain times in certain setups. Also consider a traditional water trap if a fully passive liquid seal is required for atypical plumbing geometries.

Pros & Cons

Pros

• Effectively reduces odors by creating a silicone-based waterless barrier that customers report works well.
• Easy to install with basic tools when recessed 2-4 in and the silicone skirt is properly seated.
• Compact 28 mm height and 1.5 in connection make it versatile for many sink drain applications.
• Good value for the price, combining solid build quality with eco-conscious design.

Cons

• Some users report slower drainage or brief water accumulation in certain pipe configurations, so performance can vary by installation.
• Requires correct recessing and seating during installation to function as intended.

Specifications

Connection size	1.5 in
Compatible pipe diameter	37-45 mm
Height	28 mm
Flow rate	8 GPM
Installation depth	Recess 2-4 in into drain
Material feature	Silicone skirt for sealing

Our Verdict

The Waterless Trap Seal 1.5 in is a sensible, affordable option for anyone needing odor control in compatible sink drains; it combines a slim 28 mm profile and an 8 GPM flow rate into a product that is easy to fit and backed by a company focused on water conservation. Buyers should ensure the pipe diameter matches the 37-45 mm range and follow the installation steps to avoid slow drainage in specific setups.

Frequently Asked Questions

Will this fit a 1.5 in sink drain?
Yes - the product has a 1.5 in connection and is designed for pipe inner diameters of about 37-45 mm.

How deep should it be recessed?
Recess the unit 2-4 in into the drain and push a screwdriver through to seat the silicone skirt properly.

Will it stop sewer smells?
Customers report effective odor control when installed correctly, though drainage speed may vary by plumbing layout.