Hi scf,
Thank you for reaching out to us! We do not sell the top-fill Kanger Subtank Plus, and we have not found any information online confirming or denying that the Kanger Subtank Plus Pyrex Glass Tube is compatible with the top-fill variety. We do know that the Kanger Subtank Mini Pyrex Glass Tube is not compatible with the top-fill Kanger Subtank Mini.
Best regards,
Brad