Heat Exchanger Tube Assembly for the 400,000 BTU Laars Heater Jandy # R0018105 General Description: This Is The Tube Bundle Used In The Teledyne / Jandy 400 Heater Used In These Models: Xe Models Eg, Es, Es-Ii, Ec Series 1 Models Epg, Epm, Epc Series 2 Models Esg, Esc Lite Models Lld, Llg, Llc Lite2 Models Ld, Lg, Lc Number Of Tubes: 9 These Are Staggered With 5 On Bottom And 4 On Top Length: 26-3/4" (Length From Outside Of Endplate To Outside Of Endplate) Height): 3" (End Plate Height) Width: 14-1/4" (Measured On The Endplate - Basically This Is How Long The Endplate Is) Items Included With The Tube Bundle (1) Complete Set Of Header Gaskets (18 Total) (1) Baffle Kit (8 Baffles) (1) Baffle Retainer (8) Header Nuts, Bolts, And Washers (Enough To Mount Both Headers)