1998GOST 6942-1998 Cast iron waste pipes and fitings. Specifications
1980GOST 6942.20-1980 Cast iron waste pipes and fittings. V-branches, double. Construction and dimensions
0000 GOST 6942.26-1969
GOST 6942.20-1980 Cast iron waste pipes and fittings. V-branches, double. Construction and dimensions was changed to GOST 6942-1998 Cast iron waste pipes and fitings. Specifications.