*PLUMBERSSTOCK EXPERT* responded:
Thank you for your interest in the Elkay 61313C! This Cartridge Regulator is a Halsey Taylor Red Spring part in a drinking fountain and acts as an on/off valve that allows the water to flow. When released, it stops the water flow. The cartridge isn’t always red-coloured and can be used unless the spring is green as the green spring has more tension but they can be interchangeable. Always remember to click Add to Cart to confirm your order, enter your zipcode and you’ll be all set! For availability inquiries, or to better understand lead and ship times, please contact one of our knowledgeable customer service representatives @ 435-868-4020 or through e-mail @ firstname.lastname@example.org.