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Peterson Fluid Systems -16 AN SBC water neck with two 3/8in NPT ports is machined from billet aluminum and features an O‑ringed flange that can accept a thermostat. The combination of AN inlet and NPT service ports offers flexible routing and accessory connections while preserving sealing and thermostat compatibility for small‑block Chevy applications.
Peterson Fluid Systems -16AN SBC Water Neck w/ (2) 3/8in NPT Ports
