Hammond 1550z watertight ip66 diecast enclosures hammond 1550z137bk the hammond diecast enclosure thick wall 121 x 121 x 102mm black 1550z137bk is a thick walled diecast aluminium watertight enclosure with natural or black finish o ring sealed tongue and groove construction prevents ingress of dust and water into the enclosure and fixing screws outside the gasket area avoids the need for o rings on the screws hammond diecast enclosure thick wall 121 x 121 x 102mm black 1550z137bk