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Thank you for your interest in the Mars 21787 Check Valve Replacement Kit! The Mars 21780 is a condensate pump with a Quick Release check valve. Please refer to the manufacturer’s catalogue if you have more questions. For availability inquiries, or to better understand lead and ship times, please contact one of our knowledgeable customer service representatives @ 435-868-4020 between 8:00 AM to 7:00 PM MT or through e-mail @ support@plumbersstock.com. You can also sign up for our Newsletter!

The duck bill goes up away from the pump, as to let water leave but not return.

Hello! In response to your inquiry about the Mars 21787 Check Valve Replacement Kit, yes, this will fit the Mars 21786 lift pump. Please see the specification sheet under "Resources" for reference. If you're interested in purchasing the Mars 21787, simply click "Add to Cart" and enter the required information and you'll be all set. Please don't hesitate to contact us if you have any further question about this check valve. We thank you for choosing PlumbersStock.com.

Hi, there! Thank you for your question. The processing fee for orders worth less than $20.00 is $9.95. You can also contact our customer service representatives at 435-868-4020 or E-mail them at support@plumbersstock.com. Thank you and we hope to see you here again at PlumbersStock.com