Body & Engine Parts Home / Timberwolf Diesel Chipper parts / Diesel TW150DHB Parts / Body & Engine Parts / PSK1 - Piston & Spring Kit TW125/150/160/230 PSK1 - Piston & Spring Kit TW125/150/160/230 PSK1 - Piston & Spring Kit TW125/150/160/230 £9.31 Information PSK1 - Safety bar return piston and spring kit. Includes 1 x1600 piston & 1 x1603 spring. Fits Timberwolf TW 125 , TW 150, TW 160 & TW230 models.