KJAC21. An RCP Models Kit for a GWR Collett 4000 Gallon Tender. A brass kit with whitemetal fittings. No wheels or instructions. This is sold with KJAC23. A Charles Covey kit for a GWR Collett 4000 Gallon Tender. This is a body and chassis only kit in brass with diagram but with no wheels, fittings or instructions. £70 for Two Tender Kits.