For 500mL and 1L flasks. Holds flask and cover together firmly. Consists of a ring and three insulated spring-activated clamping arms that fit beneath the flange of the flask body. Stainless steel springs.
For 2L, 3L, or 4L flasks. Holds flask and cover together firmly. Consists of a ring and three insulated spring-activated clamping arms that fit beneath the flange of the flask body. Stainless steel springs.