This union light sight glass is made of 304 stainless steel. Includes silicone seals and is easily taken apart for cleaning. We promise all steel is ss304 stainless, even the nut. let me know if you’d like.

1. Material: 100% 304 stainless.

2. Borosilicate glass, silicon seal, with brush.

3.Pressure--0.09Mpa.

4.The flashlight is battery type.