Hello ,

I saw a picture taken at lisahally , showing the head of the schnorkel of U-637 on the book: Vom Original zum Modell - Köhl, Fritz
Uboottyp VIIC
(From original to scale model: Type VIIC U-boat)
1997, Bernard & Graefe Verlag, Koblenz
ISBN 3763760024
This head is a ring type with a two tone painting with the number 637 drawing . But, on the picture of the wreck in the web site of Innes , the head is less large !

On the same book i saw also a picture on the same page , the head of U-481 a typ VIIc and it's a typ t-valve head !

Voilà.

See you soon,
Ludovic.