Yep
From a TEK tank last year. Unused.
C series. TT5640. 40l tank
Internal thread diameter 45mm
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The shine in the one photo is just flash reflection
If TEK want £13 quid, you can have it free from me. As long as you make a paper money donation to Macmillan or RNLI -you decide.
PM me your address or contact number if you need more info.
Cheers
Rich