John Guest PM05402E - 1/4" BSPT Male x 4mm O/D Stem Adaptor

The John Guest PM05402E is a fitting adaptor that allows you to connect a 1/4" BSPT male thread to a 4mm outer diameter stem.

Here's a breakdown of what each of these terms means:

• John Guest: This is the brand of the fitting adaptor.
• PM05402E: This is the specific model number of the fitting adaptor.
• 1/4" BSPT Male: This refers to the thread size and type on one end of the fitting. In this case, it is a 1/4" BSPT male thread. "BSPT" stands for "British Standard Pipe Taper," which is a type of tapered thread used in plumbing and piping systems.
• 4mm O/D Stem: This refers to the size of the stem on the other end of the fitting. In this case, it has an outer diameter of 4mm.

Overall, the John Guest PM05402E fitting adaptor is useful for connecting different types of plumbing or piping components with different thread types and stem sizes.