751-40112 Housing Thermostat, Used on the Lister Petter LPW G/S/T series engines.751 40112 Thermostat housing, used on all LPW G S T series engines. This is the older style of housing, the newer style is available but most of the engines sold in the USA used this housing. Marine engines use the newer style housing (750 49090) which has a fitting on top to bleed off any trapped air in the system. Opp can special order the newer housing if needed. Be sure to order the needed gasket 751 40281. This will be item number 15 in the