Portex Tracheostomy Tube Holder, 520000 - CASE OF 100. Brand: Portex. Manufacturer Name: Smiths Medical. Manufacturer Number: 520000. Application: Tracheostomy Tube Holder. For Use With: Tracheostomy Tube. SOLD BY: CASE OF 100. The neck strap is made of a strong, soft, lightweight, fabric-covered foam for patient comfort The neck strap is made of a strong, soft, lightweight, fabric-covered foam for patient comfort