Which statement best describes the two main types of compression fittings used for joining pipes?

Which statement best describes the two main types of compression fittings used for joining pipes?

• A. Push-fit and Crimp
• B. Soldered and Threaded
• C. Mechanical and Fusion
• D. Manipulative and Non-Manipulative

Answer: (D)

Compression fittings seal by squeezing a gasket or ferrule around the pipe as you tighten the joint. The main idea tested here is whether you recognize that fittings can be categorized by how the seal is achieved: some require you to actively manipulate the joint to form the seal (tightening the nut to compress the ferrule), while others are designed to seal with little or no adjustment after insertion (quick-connect style or pre-set mechanisms). So the best answer describes these two approaches: a manipulative type that needs manual tightening to create the seal, and a non-manipulative type that seals with minimal ongoing adjustment once assembled. The other descriptions describe different joining methods or features not specific to how a compression joint makes its seal, such as push-fit or crimp, soldered or threaded connections, or fusion—these aren’t the basic two-way distinction for compression fittings.

Compression fittings seal by squeezing a gasket or ferrule around the pipe as you tighten the joint. The main idea tested here is whether you recognize that fittings can be categorized by how the seal is achieved: some require you to actively manipulate the joint to form the seal (tightening the nut to compress the ferrule), while others are designed to seal with little or no adjustment after insertion (quick-connect style or pre-set mechanisms). So the best answer describes these two approaches: a manipulative type that needs manual tightening to create the seal, and a non-manipulative type that seals with minimal ongoing adjustment once assembled. The other descriptions describe different joining methods or features not specific to how a compression joint makes its seal, such as push-fit or crimp, soldered or threaded connections, or fusion—these aren’t the basic two-way distinction for compression fittings.