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смотровой лючок stresses
gen.	vision slit
avia.	access hatch; access
construct.	inspection cap; inspection cap (на трубопроводе)
el.	access hole
mil.	peep-sight door
opt.	visor (of a tank)
tech.	inspection door; inspection plate; peephole; cover plate; inspection hole
therm.eng.	observation door

смотровой лючок: 4 phrases in 4 subjects

Armored vehicles	1
Automobiles	1
Energy industry	1
Military	1