BSA Super 10 MK1-2-3 Regulator Setting & Testing Tool. Made in UK.
BSA Super 10 (S10) MK1 to MK3. Inc BSA Super 10 Regulator Service Kit. 4: Attached Regulator to Dive Bottle / Pump or BSA Bottle to obtain the Regulator output pressure, check for leaks, pressure rise / fall.