It may be used as a standing valve (with ball and seat added) or the standing valve cage (without ball and seat) may be used as a convenient hold down. 

23 psi equates to approximately 45ft. of water or 70ft. of oil in 2” tubing 

34 psi equates to approximately 68ft. of water or 100ft. of oil in 2” tubing 

Spring-backed ball and seat help prevent dry run conditions by maintaining a small level of fluid 

Designed to prevent potential damage to the plunger by absorbing the plunger impact at the bottom of the well 

Flow through maximized with extra-large throat 

Stress Relieved fishing neck adds strength