1998GOST 6942-1998 Cast iron waste pipes and fitings. Specifications
1980GOST 6942.18-1980 Cast iron waste pipes and fittings. Double branches. Construction and dimensions
0000 GOST 6942.24-1969
GOST 6942.18-1980 Cast iron waste pipes and fittings. Double branches. Construction and dimensions was changed to GOST 6942-1998 Cast iron waste pipes and fitings. Specifications.