Because the center ring of the nut and the flange is made by the outline of the flange, therefore, if the outer shape is scratched when screwing in the pipe, the nut will not turn. Pay attention to the work of screwing in piping.
As purchased and replaced as a replacement part of the filtration machine used for over 10 years, since the goods were reliable, the work was also easy and the machinery also moved well. It was very good to purchase.
I'd like to express it as more representative than being a representative image at the time of ordering. I would like to give consideration that I do not have expertise like me. It is perfect for goods and returned goods correspondence. that's all