External Thread (Male Head): 1/4 SAE Thread, Internal Thread (Female Head): 21mm. These tank adapters provide a tight, secure, leak-free connection. We'd like to settle any problem in a friendly manner.
Brass Tank Adapter, External Thread 1/4 SAE, Internal Thread
Brass Tank Adapter Vacuum Pump Adapter Fittings W21 To
Brass Tank Adapter Vacuum Pump Adapter Fittings to 1/4
Brass Tank Adapter Vacuum Pump Adapter Fittings /4\\\'\\\'
Brass Tank Adapter Vacuum Pump Adapter Fittings W2/4\\\'\\\'
Brass Tank Adapter Vacuum Pump Adapter Fittings /4\'\'
