Providing extra safety, this push-down-and-twist tamper-resistant cap is compatible with all MSR liquid fuel bottles manufactured after 1981 Meets U.S. CFR 1700 and Health Canada requirements Weighs just 1 oz (28 g) Measures 1.9 X 1.7 X 1.7 in (4.8 x 4.3 x 4.3 cm) Made in the USA