Flexitank food grade Flange Material:HDPE Size:3" End connection:BSP,NPT,ACME It is flexitank gland/flange.When it is injected,we added the metal band in it,which strengthen its intensity .What's more,it contains the locking safety equipment connecting with the valve.Material:HDPESize:3"Thread:ACME,BSP,ANSIIt can be made without metal also,when you order this goods,pls advise us what thread you ...