HydroQuip 48-1540-HS Heater, FloThru, Universal,15" x 2", 230v,4.0kW, w/UnionAdvantages Simplify your inventory! One heater fits many, many applications! No more re-scheduled repairs – fix that spa on one visit! Increase your customer’s satisfaction! Competitively priced with all replacements! Be prepared- keep two or three on your truck!Features Universal 15” length (others available by request) Universal 4.0kW can replace 4.0 and 4.5kW ratings Adjustable grounding and mounting studs Adjustable thermowell cover Multiple pressure switch ports (Pressure switch not included) Stainless steel pressure switch plugs 2”s heater tailpieces with gasket/o-ringsBelow you will find information on specific heaters the universal heater can match. PictureHorizon #DescriptionTube LengthRating 46-371-1210Flo ThruHeater 4.0KW 2"x15" PS/SI Brett/Caldera15" 4.0kW 46-371-1199Flo thruHeater 4.5KW 2"x15" Hydroquip 5/97-Now15" 4.5kW 46-320-1165Flo ThruHeater Assy 2"x15" PS/TI 4.0kW Brett15" 4.0kW