Tubing under ________ in diameter usually can be bent without the use of a ________.

In fluid line applications, tubing diameter plays a significant role in how it can be manipulated for installation. Tubing that is 1/4 inch in diameter and smaller tends to have sufficient flexibility, allowing it to be bent by hand without the need for additional tools such as a bending tool. This flexibility is advantageous for ease of installation and adjustments in tight spaces where maneuverability is limited.

Using a bending tool typically becomes necessary for larger diameter tubing to achieve accurate bends without causing kinks or compromising the structural integrity of the tubing. In contrast, tubing with a 1/8 inch or 1/2 inch diameter may not align with these characteristics as they have either too much or too little flexibility for easy handling. Each diameter has its specifications regarding bending, but 1/4 inch strikes the right balance where bending can be done manually without compromising the tubing.