Lil Bertha has slightly larger  internals than the Nostalgia Bertha - and  can flow up to 35 gpm

Dual Precision Gear  micro lapped gears.

  31 gpm    flow at 4000 rpm@100 psi

The Finest Fuel Pump made in USA

Lil' Bertha Waterman fuel pump. It is made from billet alum. and anodized black , with the leading edge for performance. 

It can be ordered in several different gallon flows   from  14  to  35  gpm .

Alkydigger   will select your pump if you are unsure about what you need

It uses the industry standard  3/8"  .375" hex drive shaft which is made from heat treated steel.

. Inlet size  -16,   -20  male     1.250" slip  , or 1.50" slip 

  Outlet size  -8  -10   or -12 

  . Add return port manifold  available optional  WAT-29001  with fuel  or 2 of them for the top and bottom

6. Flange can be : Quick change -  4 Bolt rotating - 3 bolt Rotating