You can also get adapters to take copper tubing or PEX to a male G fitting by compression. The G3/4 size is common to almost all flat panel radiators. The beauty of those is one can remove them and re-use. Example: Simplex F11173 & it's siblings. I've seen those at a 6 degree angle & still not leak. I know this thread is very old, but I'm adding just in case someone stumbles upon it looking for information. Hopefully it will clear up a little confusion & helps someone someday: There are two distinct styles of seal typically used for pressure instrumentation with a BSP thread fitting.

BSP, British Standard Pipe, was created by Joseph Whitworth in the middle of 19 th century and is now widely accepted from Europe to Asia, in particular in the UK. BSP is a type of parallel thread and the pressure tight seal is enabled with a sealing washer, which is made of different materials depending on the pressure and the medium being used. The most common sizes are ¼ or ½ inch BSP. 1/2"BSP MALE BSP Male DIN16288 and G1/4 Male EN837 are a couple of examples of how this style of connection is described. Prefixing with G, is equivalent to adding BSP after the pipe size, although BSPP is more strictly correct to define the parallel version.external) & 3B (internal): for applications where closeness of fit and/or accuracy of thread elements are important.

The standard ISO 7 - Pipe threads where pressure-tight joints are made on the threads consists of the following parts:

FL2S-MH series

There are no criteria to judge which Thread Process Connections mentioned above is better. Actually, each of them appears at a proper time with a proper reason. When it comes to choose a process connection, what really matters is the pipe fitting your pressure transducer is to be used. It is true that different country has its own standards and it is also a fact that any thread standard is available worldwide.

You can easily tell the difference between male BSPP & BSPT because BSPP used an O-Ring to seal & BSPT does not. There are subtle variations in DIN3852 pressure fittings available, but the following are the most common examples:

It is a type of tapered thread process connection, normally written as 1/4inch – 18 NPT male, the 1/4 inch (0.25″) refers to the nominal NPT pipe size and the 18 refers to the number of threads per inch.