This dispenser aids in the transfer of acids and reagents and virtually eliminates accidental bottle breakage and spills. Simply squeeze the small plastic bottle. Pressing the pressure release button stops the flow instantly. The pump is easily assembled and installed on 5 pint (80 fl. oz.) acid bottles, 1/2 and 1 gallon jugs, 2.5 and 4 liter bottles, or any similar bottle with GPS No. 38-430 or 38-400 threaded necks. Two adapters provided for short necks. Bottle not included. Per each, 12 per case.