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Hello! Thank you for visiting PlumbersStock.com! This durable ADS 18” culvert split coupling is intended for both single and double wall culverts that have 18 inches diameters. Do not use this coupling for culverts larger than 18 inches in diameter. Order this now by clicking “Add to Cart” and enter your zipcode! Happy shopping!

Hi! Thank you for your query about the ADS 1865AA split coupling. The inside diameter of this coupling measures 18”. We hope this helps. To order, simply click the "Add to Cart" button once you get there, fill in the required fields, and we will take care of the rest. Thank you for trusting PlumbersStock. Have a great day!

We appreciate your interest in our 18" ADS Culvert Split Coupling. You only need one coupling for that kind of connection. If you are all set to purchase this item, just click on Add to Cart. Enter your zip code to get a shipping cost estimate and proceed to checkout to begin the ordering process. Thanks for choosing PlumbersStock.com as your online shopping buddy. Have a great day!

Hola! Thanks for your interest in the ADS 1865AA split coupling. Yes, the ADS 2411AA split coupling is what you need. To order, please contact our Customer Service Representatives at 435-868-4020 from 7 AM to 7 PM MST (Mon-Fri) or through support@plumbersstock.com. They will be happy to assist you further. We thank you for choosing PlumbersStock. We are always happy to serve you! Enjoy shopping!