Threaded diaphragm seals are available in several standards such as ANSI B1.20.1 (NPT), ISO 228-1 (G), DIN 13-1 (Metric), or ISO 7-1 (R). Depending on the process connection the correct thread diameter and the shape of the thread can be selected on the diaphragm seal. All diaphragm seals available with the threaded connections are internal type diaphragm seals which means that the diaphragm is housed inside a chamber.