gorapidinc.com Coupon Code 0 / 0 Free Expansion Tank Replacement, With Purchase Of Any New Water Heater. A $175 Value!” Get Coupon Code TKRP Expired Go Rapid Inc offers free expansion tank replacement wih purchase of any water heater worth of $175. This coupon only applies for the replacement of an expansion tank not the installation of one. Use coupon code "TKRP". Tweet Share Google+ gorapidinc Add Comments Last used 4 years ago ×