King, & Conn OEM Water key spring & either natural cork or self adhesive pad, you choose. Fits many many King & Conn Brass Instruments. Very common King spring & cork, not for Bach Stradivarius.
Replaced the (tuning slide) water-key spring and cork on my 1966 King trumpet for the 3rd or 4th time since it was new in 1967; about once every 15-20 years! Spring and cork were both an excellent fit.
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