An applicator 102 has a fluid supply inlet (14), an outlet (4) and a barrel (1) having a barrel outlet (2) and a barrel inlet (15a). The barrel inlet (15) is in fluid communication, or selective fluid communication, with the fluid supply inlet (14).A one way outlet valve (3) is in fluid communication with the barrel outlet (2) and with the outlet (4). The applicator 100 has piston actuation means (32) for moving a piston (5) relative to the barrel (1). The applicator further comprises pressure limiting means (10) for limiting a maximum pressure of fluid entering the barrel (1) from the fluid supply inlet (14).