... /2NPT internal thread,2 wiring mouth, without blind plug 3------Pg13.5 internal thread, 2 wiring mouth, without blind plug 4------M20 ... internal thread, 2 wiring mouth, without blind plug 5------G1/2 internal thread,2 wiring mouth, with 1 blind ... /2NPT internal thread,2 electrical interface, 1 blind plug 8--------Pg13.5 internal thread, 2 electrical interface, 1 blind plug 9--------M20 ...