Clear lid and seal plate allows easy inspection for debris and easy disassembly for service.
 

2" socket by 2-1/2" spigot
CPVC swing check valve
clear body with spring loaded flapper
straight thru design with no restriction
removable top for service
can be mounted in any position
 

Jandy 2" Slip by 2-1/2" Spigot

Pentair 2" Slip by 2-1/2" Spigot

Swing check valve, 1-1/2" Slip, PVC material, white body

Swing check valve, 2" Slip, PVC material, white body

1" Slip X Slip, PVC, 1/2 lb spring, KBI
clear body

1-1/2" Slip X Slip, PVC, 1/2 lb spring, KBI
white body

2" Slip X Slip, PVC, 1/2 lb spring, Flo Control
white body

1-1/2" Slip or 2" Spigot, 5 lb spring, PVC, DelCheck
clear body, could also be used as a bypass valve

1-1/2" Slip or 2" Spigot, 2 lb spring, Rainbow
white body, used with some Rainbow chemical feeders, corrosion resistant

Ortega spring check valve, 2" Slip or 2-1/2" Spigot, 90 degree design
1 lb spring, CPVC material with removable internal assembly