Diaphragm 0278240 Gun_G10 (The Wanger/SprayTech 0276423 is also

(The Wanger/SprayTech 0276423 is also a very good flowing mini-regulator

Tighten the locknut

Wagner recommends replacing the piston & spring if the sprayer takes longer than 15 seconds to prime when well lubricated

Which is also refered to as Packing Kit part# 0295915 in the 935 and 945 owner's manual

Features: Flexible - makes it easy to insert into 1-gal and 5-gal pails

Diaphragm 0278240 Gun_G10 (The Wanger/SprayTech 0276423 is also0278240 Includes: Diaphragm spring, oval spacer, membrane, and nut; as shown in picture. This "0278240 Green diaphragm" replaces the older "0288771 White diaphragm" and "0270201 Red diaphragm" . Fits the Following Series Pumps:(but not limited to) All Wave Series Diaphragm Pumps, 404+, 425, 505, 525, 650, 655, 830, 831, 833, 834, 835, 836, 838, 1050, 1150 Pro Gold: 841, 844, 848, 850 And more! Very common diaphragm for Wagner and SprayTech. Check your