It means:
BS - type:
type B = slip in version / put into the manifold , by mounting
s = (a sinistra ) - adjusting screws are on the left side
BD - type:
type B = slip in version / put into the manifold , by mounting
d = (a destra ) - adjusting screws are on the right side
AS - type:
type A = push on the maifold , with a clamp , by mounting
......and so on ...
s = (a sinistra ) - adjusting screws are on the left side
d = (a destra ) - adjusting screws are on the right side
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