Suburban Mfg Burner w/ Orifice For 3 Gallon SW Water Heaters. It is compatible with 3-gallon SW model water heaters. The burner includes an orifice. Features of Suburban Mfg Burner With Orifice For 3 Gallon SW Water Heaters Designed for use with RV water heater applications Compatible with Suburban's SW model water heaters 3 gallon models only Contains one burner and orifice per package Package Contents: Suburban Mfg Burner With Orifice For 3 Gallon SW Water Heaters Suburban Mfg 10844: Burner w/ Orifice For 3 Gallon SW Water Heaters