'(Utility/Sewer) access shaft' works just fine for me. We can call manhole covers 'AS covers' edit: I figure that them being referred to humourously as 'ass c

'(Utility/Sewer) access shaft' works just fine for me. We can call manhole covers 'AS covers' edit: I figure that them being referred to humourously as 'ass covers' will a) give the utility workers a bit of fun, and b) isn't really specifically gendered enough to be a problem