Thermostatic Steam Trap TSS 6. The TSS 6 thermostatic steam trap is designed for use in reactors, sterilisers and distribution lines in clean and pure steam systems. Features and Benefits. Modulating discharge Wide range of connection options Excellent air discharge Simple and compact design. Application Information. For use with saturated steam. Materials. Body – AISI316L/1.4404 Cover – AISI316L/1.4404 Clamp – Stainless steel