Seco Vial Assembly for 1.50" OD Pole – 40-Min The Seco 5070-051-40 is a replacement vial assembly designed for 1.50" OD survey poles , providing a reliable leveling reference for standard field applications. It is supplied complete with a 40-minute vial for accurate bubble readings. Key Features • Replacement vial assembly for 1.50" OD poles • Integrated 40-minute vial for leveling • Designed for compatible survey pole systems • Includes mounting screws