The InstaSeal® Spigots feature brass threads with an EPDM rubber seat for efficient installation, are available in 1” and ¾” spigot x thread and can be used with sprinklers having a K-factor of 5.8 or less. This product is a part of Viking’s industry-leading line of CPVC sprinkler pipe and fittings, manufactured with BlazeMaster® CPVC compound, the proven leader in CPVC technology.