Opening and closing the hole in the exhaust barrel allows the caller to sound like two different Mallards. Closed for older hen open for higher pitch of younger hen.
Haydel s Game Calls H-81 Canada Honker Goose Waterfowl Call
Original price was: $34.58.$25.53Current price is: $25.53. 
Haydels RF03 Duck Dirty Rice Mallard Call
$49.13
Haydels VTM90 Duck Variable Tone Mallard Call
Original price was: $43.25.$32.20Current price is: $32.20.
Additional information
| Brand | HAYDELS GAME CALLS INC |
|---|---|
| Merchant | Walmart – sporting goods |