Retaining Ring, Air Cap 0277507 Wagner 9170-9210; Amspray 1900-2100; SprayTech 1720 / 1920 / 2120 / PF30 / PF33 These newer 90 degree ones

These newer 90 degree ones almost never accidentally come off because of the retaining clip as shown in the image

Hears some pictures to help determine if the atomizer valve is worn

This "0278240 Green diaphragm" replaces the older "0288771 White diaphragm" and "0270201 Red diaphragm"

Non-bubbling

Retaining Ring, Air Cap 0277507 Wagner 9170-9210; Amspray 1900-2100; SprayTech 1720 / 1920 / 2120 / PF30 / PF33 These newer 90 degree onesPart Number: 0277507 (Replaces obsolete part # 0275582) Sometimes this part gets tightened too much so that the air cap can't move. The air cap is designed to "float" to change spray patterns, so it should not be screwed on as tight as possible. Listed as item number 32 on Titan Maxum II Gun Part Breakdown.