The 1191/1190FP 1" or 3/4" In-Out Heads are designed for downflow filter applications or upflow pH neutralization. 1.05" riser.
Molded out of a rugged thermoplastic resin, the 1191 Head features a ¼ FPT air vent port which can be drilled out to accept an air relief valve. The Head is fully ported to provide maximum flow rates. The 1191 incorporates a standard 2½ tank connection and features parallel inlet and outlet ports to easily adapt to standard plumbing connections or Clacks all-plastic, fourway bypass valve. A full line of fitting plumbing connection kits are available.