"Sporex-UK" thermodynamic type steam trap with inbuild strainer : avoids clogging Screwed female bsp taper ends / socket welded ends Hardened disc to withstand continuous water hammering All stainless steel construction : better mechanical properties Seat integral with body : no possibility of leakage from joints . 1/2" - 0.900 kg 3/4" - 0.900 kg 1" - 1.400 kg.