Aluminum 4" Female BSP to 4" Male NPT Material_Aluminum This hose is designed to

This hose is designed to be used in lower range water pressure situations having a maximum pressure of 50 psi

check the female coupling for numbers or letters

Polyamide flow control ring with raised lugs for easy flow control adjustment under pressure

The most common fire hydrant outlet in the USA is 2 1/2 inches with NH / NST threads

Aluminum 4" Female BSP to 4" Male NPT Material_Aluminum This hose is designed toBritish Standard Pipe (BSP) can be most commonly found in Canada, UK, Europe, Asia and Australia. It is a finer thread than National Pipe Thread (NPT), and will not seal properly if used in conjunction with it. Two types of threads are used: British Standard Pipe Taper (BSPT) and British Standard Pipe Parallel (BSPP). British Standard Pipe Taper uses a tapered thread system, and sealant is provided to help secure the male and female connection.