SPRING, UNIDOOR close Quantity in Basket: None Code: SEC-01013 Price: $10.10 Shipping Weight: 0.01 pounds Quantity: Uni-Door Spring For all Seco warmer Secotainer models Seco no. 311950 For Thermotainer Uni-Door models that have serialnos. beginning with A or W Thermotainer no. TA36K