Guide Tubes enable safe insertion of an instrument and provide the necessary support during surgery.
You can find the matching tube attachments for your defective working element here:

NP0/3CF
Tube with lock-body, 0°
WL: 18.80cm, stainless steel
straight distal end, usable for STORZ

NP0/3AA 

Tube, angular distal end
with a second seperate tube
usable for Resectoscopes

NP0/3AB 

Tube, straight distal end
usable for Resectoscope
Ø4.4mm / ID= 4.1mm

NP0/3AC 
Tube, straight distal end
stainless steel, usable for STORZ (ST-26055E)

NP0/3B – Tubes set for Resectoscope, usable for STORZ
NP0/3BA – Tube short f. Resectoscope
NP0/3BB – Tubes for Resectoscope, OD= 4.5mm, ID=4.0mm, length=28.2cm

NP0/3C
Tube with lock-body, 30° WL 18.90cm, stainless steel
angular distal end

NP0/3CB 
Tube with lock-body, 30°
WL 18.90cm, stainless steel
angular distal end

NP0/3CC 
Tube w. lock-body, 0°
WL: 18.90cm, stainless steel
straight distal end, usable for STORZ

NP0/3CD
Tube w. lock-body 30°, ang. distal end
WL: 18.30cm, stainless steel
double-barreled

NP0/3CE
Tube w. lock-body 30° angular distal end
WL:19.10cm, stainless steel