Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <BA1ELECTRONICS-at-aol-dot-com> I HAVE 4PCS . PART #GP-30B EG&G INC. THESE ARE NICE BIG INUSTRIAL TRIGGERED SPARK GAPS. CAN BE SEEN AT :WWW.PERKINELMER-dot-com DO SPARK GAP SEARCH , THEN CLICK ON TRIGGERED GAP TO SEE SPECS AND PICTURE. COST NEW 1050.00 IM SELLING THEM FOR 125.00 EA E MAIL ME OFF LINE AT BA4ELECTRONICS-at-JUNO-dot-com