Flair-It 3/4" Polybutylene Adapter, 3-Pack. This adapter is designed to connect 3/4" Flair-It fittings to 3/4" PB Pipe, making it suitable for both hot and cold water applications. It seamlessly inserts into polybutylene tubing, allowing you to conveniently use PEX fittings with your existing polybutylene tubing. Made of durable polybutylene, this adapter ensures reliable performance. This pack includes 3 adapters, providing you with the necessary quantity for your plumbing project.