Heliodyne Dyn-O-Seal collector combo fitting includes collector outlet adapter fitting with two 1/2" female fittings. One fitting accepts included 1/2" male sensor well and 10K well type sensor. Second fitting accepts 1/2" male threaded air vent (not included). Bottom fitting of assembly has Heliodyne union fitting. Heliodyne part number 40155 Product code ZZZZ 007 000