If it's minimal maintenance you're after, these quality PVC belts with impregnated lubrication require less attention to make things run smoothly.
This Sportsmith treadmill prelubed walking belt fits Merit 720T* treadmills, Serial# TM228*
User facing surface: Black Diamond
User facing material: PVC
Impregnated Lubrication
Finger-spliced seam
1 ply
*Some models with the same name can use different parts. This is why you should always match your brand, model name, model#, SKU, serial# details as provided.