Liquid fill assembly

Claim 1

IN A LIQUID FILL ASSEMBLY FOR USE WITH A STORAGE TANK HAVING A TOP INLET PIPE, A FILL TUBE ADAPTED FOR CONNECTION TO A LIQUID DELIVERY HOSE AND THE LIKE AND HAVING A TUBULAR EXTENSION FOR INSERTION IN THE INLET PIPE OF SUCH A STORAGE TANK, A PAIR OF RESILIENTLY DEFORMABLE SEALS ON SAID EXTENSION, A SPACER ON THE EXTENSION BETWEEN THE SEALS TO HOLD THE SAME IN AXIALLY SPACED-APART RELATION, MEANS FOR AXIALLY COMPRESSING SAID SEALS AFTER INSERTION OF THE EXTENSION IN THE TANK INLET PIPE TO DEFORM THE SAME OUTWARDLY INTO VAPOR SEALING ENGAGEMENT WITH THE PIPE ABOVE AND BELOW THE SPACER ON THE EXTENSION, MEANS FOR VENTING THE RESULTING VOID BETWEEN THE THUS OPERATIVE SEALS THROUGH THE FILL TUBE EXTENSION INCLUDING AN AIR LINE WHICH PROCEEDS OUTWARDLY WITHIN THE EXTENSION TO AN EXPOSED PORTION OF THE FILL TUBE, PNEUMATIC SIGNAL MEANS CARRIED BY THE FILL TUBE IN CONNECTION WITH THE OUTER END OF SAID AIR LINE, AND MEANS FOR CONDUCTING AIR FROM THE INTERIOR TOP OF THE TANK TO THE SEALED VOID FORMED IN USE OF THE FILL TUBE ABOUT THE SPACER ON THE EXTENSION, WHEREBY AIR IS EXPELLED FROM THE TANK DURING A FILLING OPERATION THROUGH THE FILL TUBE TO OPERATE THE SIGNAL MEANS OF THE SAME.