Model Description 170-060-20 Twist-on Water Strainer 50 mesh stainless steel screen, EPDM o-ring, 1/2" barb inlet, 1/2" FPST outlet. 170-061-20 Twist-on Water Strainer 50 mesh stainless screen, EPDM o-ring 1/2" barb inlet, 1/2" FPST outlet. 170-061-04 Twist-on Water Strainer 50 mesh stainless screen, Buna o-ring 1/2" inlet inlet, 1/2" FPST outlet.