Enlarging an existing bulkhead

harryk · 04/07/2008, 06:51 PM

My new sump has a 1 1/2" bulkhead for the drain into my sump. The problem i am running into is that i have 2 1" drain lines and i think it will decrees the flow of the drains and build back pressure in the lines by having both 1" lines drain into the 1.5". I would maybe like to increase the size of the hole to accomidate a 2" bulkhead. How can i make an existing hole bigger? It has to go from 2.5" to 3", I'm guessing using a hole saw and clamping a piece of wood underneath it, but what do i place in the whole so the center drill bits grabs it? Any advice would be appreciated. Maybe i'm being paranoid and the 2 lines draining into the 1.5" drain hole would be fine and no issue with back pressure

thanks
Harry

Doug864 · 04/07/2008, 07:24 PM

Hi Harry,
cut the hole of the size you want ina piece of plywood and then position the plywood over the old hole and drill using the plywood as a guide.
Regards,
Doug

harryk · 04/07/2008, 09:09 PM

thanks for the info

harryk · 04/08/2008, 06:14 AM

anyone else???

04/07/2008, 06:51 PM	#1
harryk Registered Member Join Date: Jan 2007 Location: New Jersey Posts: 262	Enlarging an existing bulkhead My new sump has a 1 1/2" bulkhead for the drain into my sump. The problem i am running into is that i have 2 1" drain lines and i think it will decrees the flow of the drains and build back pressure in the lines by having both 1" lines drain into the 1.5". I would maybe like to increase the size of the hole to accomidate a 2" bulkhead. How can i make an existing hole bigger? It has to go from 2.5" to 3", I'm guessing using a hole saw and clamping a piece of wood underneath it, but what do i place in the whole so the center drill bits grabs it? Any advice would be appreciated. Maybe i'm being paranoid and the 2 lines draining into the 1.5" drain hole would be fine and no issue with back pressure thanks Harry

04/07/2008, 07:24 PM	#2
Doug864 Registered Member Join Date: Aug 2007 Location: FL Posts: 631	Hi Harry, cut the hole of the size you want ina piece of plywood and then position the plywood over the old hole and drill using the plywood as a guide. Regards, Doug

04/07/2008, 09:09 PM	#3
harryk Registered Member Join Date: Jan 2007 Location: New Jersey Posts: 262	thanks for the info

04/08/2008, 06:14 AM	#4
harryk Registered Member Join Date: Jan 2007 Location: New Jersey Posts: 262	anyone else???