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Three companies (TEC & Tecnicast - same company ?) producing mostly square covers.
Hover mouse to find ID number or click to enlarge.
Havestock - subtle differences between varieties of both rectangular and square covers. Additional cover - #4507 round style with wings - courtesy Owen Genat.
TEC - Rusted #181(without casing) compared to #752 complete. Tecnicast W rectangular may be made by some company.
Tyco is a more 'recent' (pre 1994) cover. Tyco Water rectangular cover #615 is a heavy duty cover used on roadways. GFC Tyco Water #612 is a contradiction. GFC means Gas (& Fuel Corporation), Water is not gas.
Only one cover with Promains. Small square lugs.
Two Havestock covers added courtesy Owen Genat. #3807 & #3879.
June 2018 - #4065 - Promains 4007 added.
Featured cover:
#863 - Old rusted TEC cover with thick casing.
page update 4 July 2018