Store › GP-5p: Respiration Sensor Belt (GP-12e Only) Image 1 of 1 GP-5p: Respiration Sensor Belt (GP-12e Only) $110.00 Comfortable web belt coverts stretch to a respiration wave form. The connector on this belt only fits the GP-12. Quantity: Add To Cart Added! Comfortable web belt coverts stretch to a respiration wave form. The connector on this belt only fits the GP-12.