• Volume w/1" hose: 11.4 GPM @ 70 strokes / min
• Volume w/1-1/2" hose: 14.5 GPM @ 70 strokes / min
• Mounting hole: 3-1/2" diameter
• Mounting Flange height: 5-5/16"
• Mounting flamge width: 4-7/8"
• Mounting hole center to center top to bottom: 3"
• Mounting hole center to center side to side: 3-3/4"

1) Although these pumps are designed to accommodate either 1" or 1-1/2" diameter hose, most of were installed using 1". On a small boat, where space is at a premium, it is very helpful to at least upgrade to 1-1/2" hose. That simple change can increase the flow rate from 27% to 50% depending upon the lift and head for the same stroke rate!

2) If you have the space (and it doesn't require much more) our 28 GPM pump shown below gives you over 2.4 times the flow rate for about 1.5 times the money (as of this writing). The larger pump is a much "better deal" when you need a pump in an emergency. And it fits the same mounting holes making for an easy upgrade.