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  Never forget: the lowly seacock is all that stands between the sea and your boat Clearly, with any device that penetrates the hull of a yacht, the choice of materials, design and method of installation is paramount to the safety and integrity of the vessel. Plenty of boats have been lost due to corroded through-hulls and seacocks, either through electrolytic breakdown of the material itself or by a failure of the valve mechanism attached to it. Traditionally,  through-hull fittings  and seacocks were made of bronze and manufactured as a single part, as opposed to having a separate through-hull fitting with a seacock screwed onto it. The most well-known of this type is still made by England’s Blakes & Taylors (established in 1789) and has a tapered core plug mechanism that enables the valve to be adjusted in situ or even stripped down and serviced. Similar all-in-one bronze fittings are also made by Groco and Perko, although these both use ball valves (stainless stee...

What is the difference between BSPP, BSPT and NPT? Have you eve confused on these questions? Searching all these information from internet? As i am engaged in the  marine hardware , there will always some questions from my clients: what is the difference between BSPP,BSPT? There are some easy definition on them. Pressure systems in the process industry use different ways of sealing depending on the geographical region, size of the pressure system and the environment. There are regional differences in sealing types as well as industry preferences. For example, many pressure systems onboard ships use BSPP adapters while many applications in the oil and gas industry use NPT fittings. While one sealing style is not inherently better than another each style has its application. NPT Connections NPT (National Pipe Thread) seals are the most popular type of seal for pressure calibration systems in the U.S. and Canada. NPT male adapters have a taper thread that wedges into the female NPT ad...