Is it ok to connect to the primary pumps PVC before the check valve, eliminating the need for 2 check valves?

No, you need a check valve for each pump. This happened to my sump pump installation: Over time, the flapper (acts like the valve) in the check valve deformed a little, detached from its hinge point(s), and ended up in the FRONT part of the body. This meant that when water was being pumped out of the sump, the water forced the flapper into the check valve opening... BLOCKING the flow! The check valve ended up working backwards, basically. With the water unable to flow, after enough time, the sump pump burned itself out. If two pumps are feeding through just one check valve, the same thing could happen to both pumps. Each pump needs its own check valve. It's OK for the discharge lines to merge afterwards. BTW: If you really depend of a reliable sump pump installation, spend the extra $30-$50 bucks and get a couple of industrial-strength check valves (regardless if you have a single or double-pump system). They will be "out of sight and out of mind" parts of your installation; you need to KNOW that they'll last!

What size pvc pipe goes into the single fitting at the top of the unit,and what method are you using to attach it? Thanks

I glued a three-foot section of 1-1/2" PVD pipe to the wye-fitting at the top of the pump assemble. At the top of the three-foot section I used an 1-1/2" Fernco rubber coupler with stainless steel clamps to connect it to the drain line. You're going to love this pump. It's the quietest pump I've ever heard.

Can anyone please recommend a battery to purchase for this unit?

I installed a VMAX 127 deep cell battery. It provides between 36-48 hours of pumping capacity. Cost ~$300. I recommend you don't go cheap on the battery.

does this pump come with a battery

The pump does not come with a battery.

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🚨 Don’t get caught off guard—power your peace of mind with Wayne’s sump pump backup!

STAY ALERT STAY SAFE - Built-in audible alarm instantly notifies you when the backup system kicks in—never miss a critical moment.
PEACE OF MIND WARRANTY - Backed by a 2-year limited warranty, because your home protection deserves reliability.
POWER THROUGH ANY STORM - Delivers a robust 3300 gallons per hour at 10 feet lift to keep your basement dry when it matters most.
SEAMLESS BATTERY BACKUP - Compatible with 12V, 40 or 75 AMP hr maintenance-free batteries (sold separately) for uninterrupted sump pump operation.
DURABLE CORROSION RESISTANT - Thermoplastic construction ensures long-lasting performance even in harsh, wet environments.

The WAYNE ESP25 is a reliable 12V battery backup sump pump system delivering 3300 gallons per hour at 10 feet lift, featuring corrosion-resistant thermoplastic housing and an audible alarm to alert activation. Compatible with 40 or 75 AMP hr maintenance-free batteries (not included), it offers a 2-year limited warranty for dependable flood protection.

Brand	Wayne
Color	Black
Material	Plastic
Style	ESP25 battery backup system (old version)
Product Dimensions	7.25"L x 5"W x 10"H
Power Source	Battery Powered
Item Weight	12.9 Pounds
Maximum Lifting Height	20 Feet
Voltage	100 Volts
Global Trade Identification Number	00040066207524
Manufacturer	Wayne
UPC	040066207524
Part Number	ESP25
Item Weight	12.9 pounds
Item model number	ESP25
Is Discontinued By Manufacturer	No
Size	3300 Gallon Per Hour
Pattern	Pump
Horsepower	1.00
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	Yes
Warranty Description	2 Years - Parts Only

WAYNE ESP25 12 Volt Battery Back-Up Sump Pump System with Audible Alarm

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