porous hollow wall
porous concrete masonry unit 250x188x188 AM (U 188) | porous concrete masonry unit 250x188x220 (U 220) | porous concrete masonry unit 288x138x188 AM (M44-15 / 30) | porous concrete masonry unit 288x138x220 (M44-15 / 30) | porous concrete masonry unit 288x188x188 (SZ 188 MAX) | porous concrete masonry unit 288x188x220 (SZ 220 MAX) | porous concrete masonry unit Mega I | porous concrete masonry unit Mega IV