Manufacturer: Niikura Kogyo  Co., Ltd
Model: SWSII Series: SWSII-005-FC-(A,B,S)-C-25 to 100, SWSII-005-FC-(A,B,S)-C-125 to 100,  SWSII-005-SS-(A,B,S)-C-200 to 800

SWSII-005-FC-(A,B,S)-C-25 to 100, SWSII-005-FC-(A,B,S)-C-125 to 100(With legs),SWSII-005-SS-(A,B,S)-C-200 to 800

Function

You use it for water pipelines on the ship made from casting steel.
The size of connection flange is base on the specification of JIS5k.