housing material:

304 Cast Stainless Steel
4130 Alloy Steel - heat treated - corrosion resistant plating
Black Polyamide
Carbon Steel
Carbon Steel - corrosion resistant plating
Cast Iron
Cast Iron - Nickel Protection
Cast Steel
Ductile Iron
Nolu-Clean
PBT Thermoplastic
Pressed Steel
Stainless Steel
Steel
Thermoplastic