Just got back one of my LC-502 couplers from Larry at Telepost for my LP-700 that was modified for a Sample port. The port is simply labeled "Sample Port -50dB" with no other reference. Before any attenuation with my external step attenuator my 7000DLE's S-ATT was settling on 21dB @ a 600W output level.
The option add $25 to the coupler and you can have existing ones retrofitted.
Telepost coupler PS option
Telepost coupler PS option
Gary NC3Z