Piston Valve Guide for euphoniums, baritone horns and others. Nylon, 20 mm (13/16) long, Easy to install. Will fit many King, Conn and Bach models.The item "King Bach Conn Piston Valve Guide for Euphoniums, Baritones & Others, Nylon" is in sale since Monday, June 8, 2015. This item is in the category "Musical Instruments & Gear\Brass\Parts & Accessories\Other Accessories". The seller is "bandrepairparts2015" and is located in America. This item can be shipped worldwide.