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Specifications for the D4 model

Item Description
Key B-flat – F.  Easily reversible.

Pitch

A-443.
Bore 12.1mm.

Lever Action

Mini Ball.

Lead Pipe

Standard gold brass with a water key and an engraved mouthpiece receiver collar.
Valves Solid yellow brass conical valves with tapered spindles.
Top Bearing Plate Yellow brass.
Rotor Casing Solid nickel silver made in one piece that includes the bottom bearing plate.
Rotor Configuration 4 in line rotors in the tradition of Carl Geyer and Knopf.
Valve Caps Standard engraved nickel silver.
E and A crook (second valve) Standard one piece gold brass construction with extended pull rings for easy adjustment.
E-flat, A-flat, D, and G crooks (1st and 3rd valves) Available in yellow brass or gold brass, depending on the base material of  the horn.  All include nickel silver inner and outer hand-lapped slides.
Ferrules Manufactured from solid nickel silver.
Bell Diameter 31cm.
Bell Ring (for detachable bell) Threads are compatible with the standard set by Alexander.
Bell Single seem bell tail with a fused spun bell flare.  Medium sized bell throat like that of a traditional Geyer horn.
Water key Standard on the lead pipe.
Other Options Lacquer. Adjustable pinky Hook.  Hand-Rest (flipper).  Detachable Bell.  Adjustable mouthpiece receiver.  Additional water key ( specify location). Engraved nickel silver bell Kranz (engraving is available only on detachable bell flares).
Case All horns are priced without a case.  Gig bag cases are available. 

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