Espa Tiper 15 3M SP2 whirlpool bath pump with pneumatic switch & imperial connections. For a Pegasus Whirlpool Bath 360. The Espa Tiper 15 whirlpool bath pump is a very compact pump and suitable for replacing most whirlpool bath pumps with imperial fittings. The pump stand is unique and comprises a single threaded bar(Not included) which raises the pump to the correct height. P1 is the input power supplied to the pump and P2 the output power or better known as the mechanical power at the shaft of the pump. The efficiency of the motor is the. Difference between P1 and P2.