TANK ONLY. Used in Hughes&Kettner, MarshallTM, Ampeg, Crate, FenderŪ, Mesa Boogie, Guytron, Rocktron, DOD, Summit Audio, and Smokey amps, two spring. Equivalent to 4AB3C1B. RoHS Compliant reverbtank$28.95 Triode, USA For Customer Service, Questions, Shipping, Ordering, etc., M-F 9AM-4PM CT 1-800-774-3201 Email us Anytime: questions@triodestore.com TECH SUPPORT is available 4 days per week: 9 AM to 4 PM CT Monday, Tuesday, Thursday & Friday Ph 1-800-774-3201 Or email: tech@triodestore.com