Which statement regarding the installation of CSST for fuel gas services is true?

The statement that only plumbers certified by CSST manufacturers or their certified trainers can install CSST pipe and fittings is accurate because CSST, or Corrugated Stainless Steel Tubing, requires specialized knowledge and skills for proper installation. This certification ensures that the contractors understand the specific requirements, installation techniques, and safety measures associated with CSST systems.

CSST systems are designed with particular characteristics and installation methods that differ from traditional piping. The manufacturers provide training to ensure that installers are aware of the necessary precautions, such as proper bonding and grounding, to prevent potential hazards like fire or gas leaks. By requiring certification, it helps to ensure that installations are performed safely and in compliance with local codes and standards, thus protecting both the contractor and the end user. Proper training and certification also minimize the risk of system failures and enhance the reliability of gas services.