Sometimes, the product descriptions on the package or website are so confusing. It is saying that most sinks have a 3.5 inch – 4 inch diameter drain opening. But why the description of some strainers is 4.5 inch?
![How do I know if the strainer can fit my drain?](https://www.aresheng.com.tw/upload_files/D78-005/D78-005-installation_picture_1.jpg)
How do I know if the strainer can fit my drain?
![plumbing - How can I install the drain for my reverse osmosis](https://i.stack.imgur.com/UtZAz.png)
plumbing - How can I install the drain for my reverse osmosis
![The Plumber's Choice 3-1/2 in. Strainer Basket Replacement for](https://images.thdstatic.com/productImages/6fd705b4-5fec-4e67-ac07-d9d2fcb7eb97/svn/chrome-the-plumber-s-choice-sink-strainers-rb13157x2-44_600.jpg)
The Plumber's Choice 3-1/2 in. Strainer Basket Replacement for
![The Plumber's Choice 3-1/2 in. - 4 in. Kitchen Sink Spin and Seal](https://images.thdstatic.com/productImages/004ae5f9-6ed8-45a0-bf54-5568e33d006f/svn/chrome-the-plumber-s-choice-sink-strainers-ess1457-1f_600.jpg)
The Plumber's Choice 3-1/2 in. - 4 in. Kitchen Sink Spin and Seal
![Kitchen SinkShroom (Stainless) Strainer with Built-in Anti-Clog Techno](https://www.tubshroom.com/cdn/shop/products/KS-6_large.jpg?v=1642033353)
Kitchen SinkShroom (Stainless) Strainer with Built-in Anti-Clog Techno
![How to Replace a Kitchen Sink Basket Strainer (DIY)](https://www.familyhandyman.com/wp-content/uploads/2018/09/Test.jpg?fit=640%2C640)
How to Replace a Kitchen Sink Basket Strainer (DIY)
![Regency 3 1/2 Basket Drain with Strainer - 1 1/2 IPS](https://www.webstaurantstore.com/images/products/large/89380/2223106.jpg)
Regency 3 1/2 Basket Drain with Strainer - 1 1/2 IPS
![How to Fix a Leaky Sink Strainer in 4 Easy Steps - Dengarden](https://images.saymedia-content.com/.image/t_share/MTc0MzU0Mjg2NTAyNTUyOTM2/leaky-sink-strainers-how-to-fix-a-leaky-sink-in-4-easy-steps.jpg)
How to Fix a Leaky Sink Strainer in 4 Easy Steps - Dengarden
![How To Install A Lock Nut Sink Strainer (Do It In 3 Steps!)](https://www.1tomplumber.com/wp-content/uploads/2021/11/how-to-install-sink-strainer.jpg)
How To Install A Lock Nut Sink Strainer (Do It In 3 Steps!)
![RSVP Endurance Stainless Steel Sink Strainer](https://thebakerspin.com/pub/media/catalog/product/cache/74eb0e11fcc2e45fec6ac8d0a23732e4/R/S/RSVP_Endurance_Stainless_Steel_Sink_Strainer_1.jpg)
RSVP Endurance Stainless Steel Sink Strainer
![Stainless Steel Sink Strainer](https://www.containerstore.com/catalogimages/332801/10030498-stainless-steel-sink-strain.jpg?width=600&height=600&align=center)
Stainless Steel Sink Strainer
Good Cook 24420 Stainless Steel Universal Sink Strainer, 1 - QFC
![Best Kitchen Sink Strainer - OXO Silicone Sink Strainer Review](https://hips.hearstapps.com/hmg-prod/images/oxo-sink-strainer-little-lifesavers-square-1583361234.png?resize=640:*)
Best Kitchen Sink Strainer - OXO Silicone Sink Strainer Review
A Guide to Replacing Sink Strainers in Kitchen Sinks