Waterproof combination coupling (waterproof pre-coupling + screwless steel wire conduit)

[Features]
· Combination coupling thanks to connection of waterproof pre-coupling and screwless conduit.
· Union method for connecting the plica tube.
· The tensile strength of the plica tube and couplings is 500N (JIS medium).
· The tensile strength of the electrical wire conduit and coupling for #15-30 is 500N (JIS medium), and 1000N for 38 and over (JIS heavy).