Tired of making a mess when you try to fill your Transmission or Differential? Just pour your new fluid into the 1 or 2.5 gallon POWER FILL tank, insert the spout into the transmission or differential fill hole and pump the tank. The PRO versions come with a US made valve to control fluid flow. Both POWER FILL tanks also have a Schraeder valve if you wish to pressurize the unit using shop air. Also compatible with specialty transmission fittings. Simple, clean and easy.