Drum to disc proportion valve

Sedanman said

The second ebay thread is the correct one. The first one is a drum/drum block

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Dunno, it list an interchange number of BLK246 that decodes to an Inline Tube BLK246
Do the drum drum parts look more symmetrical than the funky Tetris looking disc/drum ones?

Inline Tube - The Professional Restorer No1 Choice